#she is absolutely DISPROPORTIONATE in comparison to a “normal” human being

[sometimesmaybespoof]

Real height difference from my silly to my mutual's/bestie's/pookie's silly.

@cult-rangoons

Also hi I haven't posted in a hot minute lmao.

[bitch-in-a-bag]

can we talk about how the LGBT movement has changed in the past 15 years?

in the light of the events surrounding Chris chan, and people prioritizing pronouns over the rape of a woman with dementia, I think it displays just how... different things are.

i personally feel like it's been co-opted by the more loud and entitled mtfs/ males/penis-havers/whatever pc term exists for the XY chromosome'd, who go too far and aren't reasonably kept in check. I think terf no longer has meaning anymore because it's just become a word we use to silence anyone that disagrees with a trans woman. immediately you're going to call me a terf, I accept that, but please continue reading. I may suprise you. calling someone who's transgender a terf is kinda messed up anyway, and that's exactly why im writing this.

I also think that everyone else (allies, ftms, etc) have followed suit because they've written this messed up narrative that EvErYoNe iS VaLiD. except for trans penis-havers, bc they're the most oppressed and the most valid, actually, regardless of their experiences.

I never used to believe the above because it was always written off as terf shit, and ignoring it kinda benefitted me, but between seeing ftms getting bashed for refusing to follow new "TME" rules as if they aren't trans too, and seeing outrage around Chris chans pronouns, I think it's time to start saying things that may make people uncomfortable. innocent people are already getting hurt by this, and we need to do better. it's time to get uncomfortable.

I want to remind you that perception is both the relying factor, and also the downfall of newer lgbt theory. if my profile were mtf coded, maybe it currently is, you'd call me a self hating trans and I wouldn't be that big of a deal. terfs would probably target me.

if my profile was ftm coded, I would be absolutely skewered for daring to speak out about these issues, even though they do actually affect ftms disproportionately. terfs would try to convince me that being trans is a plague and a mental illness, and to just ~be a cis woman~!

and if assumed cis, I would 100% be assumed radfem terf, and everything I say would immediately be dismissed because of the genuine damage terfs have done. but terfs would still probably flock to this post and berate me for daring to validate trans people At All, because to them, being transgender is a mental illness akin to an eating disorder, and "giving in" to it is "self harm". clearly I don't believe that, so hopefully you'll give me at least some benefit of the doubt.

so, does my identity matter? i have a feeling you'll say yes, because it gives us a good idea of experiences I do and don't have expertise in, and thus room to talk about. but I refuse to directly identify what I actually am because I want the focus of any resulting conversation to be my message and not my self identification. if you read between the lines and figure it out that's just fine, but I would like to be heard first and foremost.

my profile is thus an attempt at being cis female coded, somewhat out of comfort, and that is likely what I'll be assumed to be due to the beliefs I am expressing, even though there is a substantial risk of getting misgendered and dismissed, no matter what my birth sex may actually be. i will give you a hint about my identity: I am transgender, on HRT and everything, and I have been personally affected by all of this. rest assured, this is well within my lane to speak about, and it does matter if you misgender me.

I want you to really think about that. before you respond, really think about if someone saying words on tumblr, talking about their OWN experiences and their take on recent history that applies to themself, really more worthy of being misgendered and harassed than... someone who said they transitioned so they could date lesbians, and then raped their own mother with dementia.

is that fair or just? or is this just a new way of letting people with penises do whatever they want? I personally think it's the latter. we need to hold people like Chris chan accountable without getting caught up on something as minor **in comparison** as misgendering and self identification. Is it sad and confusing that someone who self IDs as transgender became 1:1 with the most dangerous stereotypes that exist for trans women? Of course it is. But it doesn't mean that self identification is suddenly more important than a literal crime being committed.

I would normally dismiss it as a fluke or outright trolling if the evidence weren't so damning that this is in fact a real event that happened. If I hadn't seen this happen to other people, and if I didn't literally know another mtf person who used their dysphoria as an excuse for date rape on multiple occasions and never got any consequences for it.

It's not a one time thing, it's a developing problem that we need to stop before more people have their lives ruined. I can't even imagine how traumatizing and messed up it is for an FTM person to be date raped, by another transgender person no less. When I, an abuse survivor, told people of this MTFs red flags, people violently silenced me. People who didn't know I was trans called me a terf and transphobic. We, as a community, could've protected someone from getting date raped, and we didn't. Trans women can be awful, horrible fucking people, because they are people. Protecting them at all costs is wrong. Protecting them from transphobia is what we should be doing.

That being said, misgendering is still skeevy, and I haven't done anything like raped a disabled woman who is no longer able to consent, or date raped my own partner. if you give a shit about respecting my identity, please use they/them for me. if not, use visual perception and make assumptions that will most likely be incorrect, skew your own argument, and put me on the same level as a rapist, and arguably a fetishist. And I do need to remind you that calling someone transgender a rapist and a fetishist without evidence is still definitely classic transphobia, to the letter, so I'd appreciate it if you didn't do that.

as someone who is same sex attracted, I also want to bring this up as well.

in the US in the past 15 years, the movement as a whole pretty much went "YEAH BORN THIS WAY" with Lady Gaga, and then jumped ship to prioritize mostly mtfs at every angle. do mtfs need support? absolutely. but they don't need misguided toxic positivity, and that's what it's turned into.

it's gotten genuinely homophobic to the point where actually homosexual people are constantly being erased and demonized via "genital preferences are a fetish uwu", and vulva havers, especially the trans ones, are constantly being told to shut up about their experiences.

as much as you want to deny bioessentialism, its still very much well and alive with newer trans movement sentiments when we classify ftms as not worthy of speaking about their own issues with terms like "TME". it's also incredibly ignorant towards FTMs who pass, but dress feminine for comfort, and get mistaken for MTF, and treated like garbage because of it. They are not remotely exempt from misogyny, transphobia, or the intersection of the two, and it is not anyone's job to tell them they don't ever experience that when they do. Turning ftms and biological homosexuals into our enemies-- especially when the actual cause is transphobia and harmful gender stereotypes-- does nothing good or healthy for our movement.

Dont be mistaken, though, passing isn't the focus or end all be all here, it's the perception of others that ends up drastically effecting your experiences. There are words like misogyny that imply treatment via birth sex, however this too can be reliant on external perception. If an MTF individual either transitions very young, has an abundance of resources to transition, or just gets lucky and passes well, chances are she will experience a lot more misogyny than people may give credit to. inversely, someone who just started questioning yesterday, but lived as a male their whole life up until then, they genuinely cannot speak about misogyny with that much room because they simply haven't experienced it at an accurate enough angle or for enough time to understand it as a repeated and sociological force.

It works the other way as well, though; someone who's known that they're trans for a long time and haven't had the resources to transition, or do not or cannot pass in the eyes of society; these people suffer pain that we don't neccesarily have a word for yet, imo. It makes dysphoria worse and it makes living seem hopeless. And as a community, we deal with this is in a really messed up way by over-validating them instead of solving the core issue at hand. and people who suffer from this, but also acknowledge they can't claim what they haven't experienced, are left with nowhere to go.

And its important to acknowledge these things because they're integral to the over-encompassing trans experience. Instead of lying to everyone and telling everyone they pass/giving out unconditional positive regard, our focus should be making it so that it **doesn't matter if you pass**. that you're still worth respect and dignity if you're transgender, no matter what passing is or what it means to you, and no matter how you present. But also, if you do something awful, you still need to be held accountable, especially if you use yourself, your body, or your trans status to contribute to other axi of oppression.

Transphobia is a word that encompasses and addresses all of that, regardless of birth sex. "TME" shuts that down in favor of only letting MTF's speak. Which is still very bio-essentialist, and I can't help but feel like we've gone full circle.

Once upon a time you couldn't even get married if your partner had the same genitals as you. in the US, this was less than 7 years ago. and if you care about human rights activism, you know damn well that legal modification is not the end all be all. people who are genuinely homosexual are still oppressed, but the trans movement has started stepping on them to make ground we don't deserve. homosexuals are ok and valid. it's not a genital preference, and the prescence of trans people doesn't make conversion therapy sentiments ok, ever.

we've gone full circle, and it's not right.

[parkinsonismblr-blog]

brain sex

Sex beyond the genitalia: The human brain mosaic

“Under absolutely no internal consistency, ∼80% of “brains” showed substantial variability compared with 0.1% that showed internal consistency (Fig. S1E). A comparison of the ±5,000 simulated condition to the actual data, in which 6% of brains showed internal consistency and 35% showed substantial variability, suggests that noise cannot explain the pattern of results we obtained, because less noise is expected to account for the percent of internal consistency but more noise to account for the percent of substantial variability.

The lack of internal consistency in human brain and gender characteristics undermines the dimorphic view of human brain and behavior and calls for a shift in our conceptualization of the relations between sex and the brain.”

–> this study drew criticism for having standards of internal consistency that were too high and unrealistic, to which the researchers replied:

Reply to Del Giudice et al., Chekroud et al., and Rosenblatt: Do brains of females and males belong to two distinct populations?

“ Sex affects the brain, but the prevalence of mosaicism does not support the view that sex effects on the brain produce two distinct types of brains. Current data are not sufficient, however, to fully characterize the relations between sex and the brain (4). Such characterization is necessary for studying sex effects on the brain as well as for studying brain structure, function, and dysfunction in general (4). We hope future studies will soon fill in this gap.”

–> This guy wrote an article about how any study concluding that there are no significant brain differences between the sexes must have been subject to impartiality and bias, which is the natural conclusion you’d come to about a study created by women if you believe in the existence of the lady brain, the lovely ladies responded to this also:

Reaction to “Equal ≠ The Same: Sex Differences in the Human Brain”

“Thus, a critical point that is absent in Cahill’s article is that the effects of sex on the brain can be opposite under different conditions. That is, what is typical in one sex under some conditions may be typical in the other sex under other conditions. Moreover, the specific interactions between sex and other factors (environmental, developmental, genetic) are different for different brain regions, and are not necessarily stable over time. As a result, the brains of women and men each comprise a unique, ever-changing ‘mosaic’ of features, some of which may be more typical in males and some of which may be more typical in females.8Thus brains, in contrast to genitals, do not come in distinct, fixed male or female forms.”

Analysis of Human Brain Structure Reveals that the Brain “Types” Typical of Males Are Also Typical of Females, and Vice Versa

“We have recently discovered that most human brains are composed of unique mosaics of features, and concluded that human brains do not belong to two distinct types, “male” and “female,” and that one’s sex category provides very little information about the specific composition of one’s unique brain mosaic (Joel et al., 2015). The present study supports these conclusions by showing that even when biological relevance is ignored, the structure of human brains does not fit into two distinct types of brain, one typical of males and the other typical of females.”

There is no biological mechanism responsible for transgenderism, it’s entirely environmental.

Incorporating Sex As a Biological Variable in Neuropsychiatric Research: Where Are We Now and Where Should We Be?

“That sex effects may be context dependent also means that one cannot easily generalize from a single study to other conditions and other species.”

Sex Differences and Opposite Effects of Stress on Dendritic Spine Density in the Male Versus Female Hippocampus

“I realized that if certain areas of the brain could change from the typical ‘female form’ to the typical ‘male form’ under stress, there was no point in talking about the female brain and the male brain,” Joel told Haaretz (paywall).

Men and women are from Earth: Examining the latent structure of gender.

“Average differences between men and women are not under dispute, but the dimensionality of gender indicates that these differences are inappropriate for diagnosing gender-typical psychological variables on the basis of sex.”

Sex differences in the adult human brain: Evidence from 5,216 UK Biobank participants

“There were very small correlations between brain variables and the cognitive tests, and these associations did not differ by sex (consistent with a prior meta-analysis on thelink between brain volume and intelligence [49]). Mediation modelling suggested that, for verbal-numerical reasoning, a very large portion (up to 99%) of the modest sex difference was mediated by brain volumetric and surface area measures. Smaller fractions (up to 38%) of the modest link between sex and reaction time could be explained by volume or surface area.”

Basically, there are physiological differences between male and female brains but they don’t necessarily inform sexually disparate outcomes in terms of cognitive performance

From an article about the study:

“….there do appear to be many differences between male and female brains, but there’s also tons of overlap. The obvious question, when it comes to sex-based brain-structure differences, is whether they are the cause of behavioral differences. Differences alone don’t necessarily explain anything: If women are socialized to act differently than men from a very young age, this could lead to different sorts of brain structures, especially in a set of brains whose owners are all middle-aged or older.”

Beyond sex differences: new approaches for thinking about variation in brain structure and function

“ We argue that the existence of differences between the brains of males and females does not unravel the relations between sex and the brain nor is it sufficient to characterize a population of brains…given that sex interacts with other factors to affect the brain, sex effects on the brain must be understood as context-dependent, where context relates to the specific environmental, developmental and genetic conditions under which sex effects were assessed and under which the animals developed.“

The human hippocampus is not sexually-dimorphic: Meta-analysis of structural MRI volumes.

“We conducted the first meta-analysis of male-female difference in hippocampal volume (HCV) based on published MRI studies of healthy participants of all ages, to test whether the structure is reliably sexually dimorphic. Accordingly, studies reporting HCVs corrected for individual differences in TBV or ICV revealed no significant sex differences in left and right HCVs (Hedges’ g ranging from +0.011 to -0.206). In summary, we found that human males of all ages exhibit a larger HCV than females, but adjusting for individual differences in TBV or ICV results in no reliable sex difference. The frequent claim that women have a disproportionately larger hippocampus than men was not supported.”

to summarize: there are observed generalized differences between the brains of males and females HOWEVER they are inconsistent, sometimes contradictory, often exist only under specific testing conditions and are most likely the result of socialization, given that the brain is super plastic and responsive to its environment in terms of structure

a helpful insight from @smittywerbenjaegermannjensen:

“Not only are the trends in male/female behavior not absolute, but there’s no reason to believe that they are genetic or unchanging. Without these patterns being absolute, it’s easily attributed to the way we socialize our children from birth: categorically, but with varying severity. And being that the brain changes every time someone develops a skill, it’s likely that these trends are as impermanent as anything else considered to be ‘the brains wiring.’”

so then why are trans people sometimes found to have brain structures similar to that of the opposite sex, if brain sex isn’t real?

Transsexualism: A Different Viewpoint to Brain Changes

“we may predict that related brain changes result in human adaptation to specific sociocultural environments…He/she imagines himself/herself in his/her preferred gender identity rather than his/her biological sex, and thus tries to adapt his/her values, lifestyle and behaviors to his/her gender identity. Therefore, a subject with GD tries to experience life in his/her preferred gender identity and skews from his/her biological gender and normal culturally contextualized behaviors every day. Depending on how much the subject with GD persists in changing his/her gender (i.e., positive, neutral or negative transgenders) and the extent to which he/she has experienced gender identity, we will observe brain changes and, as a result, related culturally voluntary behaviors.

In general, an overview of brain morphometric and neural activity findings in transgenders demonstrates contradictory results, which cannot reflect masculinization or feminization of the transgenders’ brain"

the brain changes in response to everything from trauma to skill acquisition to socialization, and gender dysphoria is more than capable of creating this perceived similarity; if you’ve been raised to think of yourself as the opposite based on your tastes and preferences (or sexual orientation), your brain may (inconsistently) mirror that of the opposite sex. homosexual people are also often found to have “feminized” or “masculinized” brains, but gay men are not female and neither are trans identified males. it is also worth noting that homosexual and heterosexual transsexual males have different brains from each other, and heterosexual transsexual males brains do not differ along the male/female axis the way that homosexual transsexual males’ brains do, suggesting that “feminized” brain structures among MTFs are largely accounted for by homosexuality:

New MRI Studies Support the Blanchard Typology of Male-to-Female Transsexualism

“[T]he brains of both homosexual and heterosexual male-to-female transsexuals probably differ from the brains of typical heterosexual men, but in different ways. In homosexual male-to-female transsexuals, the difference does involve sex-dimorphic structures, and the nature of the difference is a shift in the female-typical direction. If there is any neuroanatomic intersexuality, it is in the homosexual group. In heterosexual male-to-female transsexuals, the difference may not involve sex-dimorphic structures at all, and the nature of the structural difference is not necessarily along the male–female dimension.”

remember that theory thats flying around about how testosterone exposure in utero can make people trans?

The Last Word on Fetal T

“In light of Jordan-Young’s meticulous synthesis, it’s hard to name any specific feature of male-typical or female-typical behavior that consistently matches up with prenatal T levels across several models of research.”

yup, that’s bullshit too!

Here are some studies that are often thrown around as “proof” of the existence of brain sex as it pertains to trans people who supposedly have the brains of the opposite sex, you’ll find that all of these studies:

have profound self-selection bias

were inconclusive in the sense that no trans male subject had a brain that was as “feminized” as the female subjects

were performed with subjects who have had varying exposure to cross-sex hormones (a confounding variable)

were performed with subjects who have experienced gendered socialization and sociocultural/environmental influences that are known to affect brain structures

Networks of the brain reflect the individual gender identity

—>Links to this study, they like to list these two separately but they’re the same: White matter microstructure in female to male transsexuals before cross-sex hormonal treatment. A diffusion tensor imaging study

“ The examination revealed significant differences in the microstructure of the brain connections between male and female control subjects. Transgender persons took up a middle position between both genders. “

There’s no evidence that these people were born with brains aligned in any way with their identified sex, and that these results aren’t the result of environment.  The average FTM subject in this study was 28, plenty of time for the brain to adapt and change, this doesn’t prove that neither dysphoria not transgenderism are caused by biological etiology. They did have higher fractional anisotropy levels than the test females, but they still weren’t as high as the test males, again they were in the middle and again this is inconclusive evidence because the brain is a plastic organ.

Transgender: Evidence on the biological nature of gender identity

“ According to the researchers the article does have some limitations due to the small numbers of individuals studied and therefore conclusions should be drawn with caution. “

Androgen receptor repeat length polymorphism associated with male-to-female transsexualism.

This was a study done between MTF males and cis males with no female controls, it doesn’t prove anything about trans males having similar brains to females. Having slightly feminized androgen receptors might make one more likely to experience dysphoria, but that  doesn’t really contribute anything to the brain sex argument OR the argument that people are born with dysphoria because again, these subjects were not infants or even children. also, correlation is not the same as causation, who’s to say these males weren’t affected hormonally by these feminized androgen receptors in ways that caused them to be PERCEIVED as feminine, which then influenced their gender identity?

“We explored the specific hypothesis that male-to-female transsexualism is associated with gene variants responsible for undermasculinization and/or feminization.”

Those gene variants are fairly likely to have an effect on your sex characteristics, and cause you to be perceived as a particularly feminine male. Being perceived in such a way can certainly influence your gender identity. This is another case of the probable pattern of causation being reversed to suit an agenda.

And only one of the 3 genes showed a correlation.

Sex steroid-related genes and male-to-female transsexualism.

“Transsexuals differed from controls with respect to the mean length of the ERbeta repeat polymorphism, but not with respect to the length of the other two studied polymorphisms. Given the small number of transsexuals in the study, the results should be interpreted with the utmost caution.”

Being born with an increased capacity for experiencing dysphoria is not the same as being born with dysphoria, and experiencing dysphoria does not make you a woman. Correlation doesn’t equal causation, and causation has yet to be established with any of these studies.

Sexual differentiation of the human brain: relevance for gender identity, transsexualism and sexual orientation.

“We have found a female-sized nucleus in the sexually dimorphic central subdivision of the bed nucleus of the stria terminalis (BSTc) in male-to-female transsexuals. Much to our surprise, however, the sex difference in BSTc volume did not become overt until adulthood.”

The CYP17 MspA1 Polymorphism and the Gender Dysphoria.

A polymorphism of the CYP17 gene related to sex steroid metabolism is associated with female-to-male but not male-to-female transsexualism.

Click-evoked otoacoustic emissions in children and adolescents with gender identity disorder.

Sample size here was fairly small, 24 boys and 23 girls. Given that 63% of children outgrow their GID/GD I’m not sure what this proves, and the causation pattern isn’t clear, if their androgen exposure affected their ear canals then maybe it affected them in other ways that caused them to be PERCEIVED as their identified sex, which influenced their identity. Or maybe androgen exposure increases the risk of one of the many comorbid psychiatric conditions often seen in gender nonconforming children, which makes them more susceptible to experiencing dysphoria.

Increased Cortical Thickness in Male-to-Female Transsexualism.

This is a study comparing MTFs to cis males with no female control. Sample size was small (24) and as I’ve mentioned, neuroanatomical variables like cortical thickness can be influenced by environment.

Sex dimorphism of the brain in male-to-female transsexuals.

“The present data do not support the notion that brains of MtF-TR are feminized.”

Regional gray matter variation in male-to-female transsexualism.

“Results revealed that regional gray matter variation in MTF transsexuals is more similar to the pattern found in men than in women. However, MTF transsexuals show a significantly larger volume of regional gray matter in the right putamen compared to men. ”

Male-to-female transsexuals show sex-atypical hypothalamus activation when smelling odorous steroids.

Sample size was 12, so that’s strike one. Also, neurological activity patterns can be influenced by environmental factors. Even with the small sample size the MTFs “occupied a moderate position” between so-called “male” and “female “ hypothalamus activation.

Male-to-Female Transsexuals Have Female Neuron Numbers in a Limbic Nucleus

First off, this study was done 20 years ago with 7 test subjects.

Second of all, this study did not see any similarities in neuron numbers between MTFs and females until early adulthood, the earliest being 22 years old, which supports my point that any structural similarities are the result of environmental factors. the people in this study claimed to be dysphoric well before they were 22; if they were feeling dysphoric BEFORE their neurons changed, than how could the neurons be causing the dysphoria?

Third: these MTF subjects were being treated with hormone therapy, which can be shown to cause neuro-structural changes, the subjects probably had neuron levels similar to females because of the hormones they were on

A Review of the Status of Brain Structure Research in Transsexualism.

This study was done on homosexual transsexuals. Homosexuality does have neuroanatomical indicators and this study was probably picking up on that. Sexual orientation is coded for by the brain, gender is not, it’s a social construct.

A sex difference in the hypothalamic uncinate nucleus: relationship to gender identity.

Only one of the subjects in this study hadn’t had any kind of hormone therapy that could have confounded results:

“The untreated male gender dysphoric person (S7), who took no hormones and kept transsexual feelings under wraps, appeared to have a large INAH3 volume—in the male range—but a female number of neurons.”

Again, that’s pretty inconclusive, he aligned with males along one measure and females along another measure, and again the brain is super plastic. This study basically had a sample size of one.

Transgender brains are more like their desired gender from an early age

This was done on hypothalamic responses in adolescents and again, by the time they got to that age they would have experienced environmental neural influences that could have changed their brain structure/activity patterns, even without hormones, that proves literally nothing.

This study shows that the hypothalamus and hypothalamic responses are neuroplastic and can change based on stress and early childhood experiences

This study shows that the brain as a whole remains plastic throughout ones lifetime

Anatomical and Functional Findings in Female-to-Male Transsexuals: Testing a New Hypothesis.

“Distinct structural and functional pattern in the own-body image network may represent biological markers for the dysphoric own-body perception in transgender individuals.”

This is speculation, there’s no evidence that this pattern isn’t caused by environment. Even if this pattern does have biological etiology, that doesn’t prove that the brain codes for gender in ways that aren’t contingent on socialization, or that gender identity is an innate characteristic.

“…in regions with reported anatomical sex differences among the controls, FtM-TR followed patterns of the gender assigned at their birth.”

This is a great example of how inconsistent these studies are, sometimes they have slight similarities with their identified sex (again, the strongest puts them at halfway between male and female controls) and sometimes they don’t.

Male-typical visuospatial functioning in gynephilic girls with gender dysphoria - organizational and activational effects of testosterone.

“Girls with GD before testosterone treatment differed significantly in frontal brain activation from the control girls (pFWE = 0.034), suggesting a masculinization of brain structures associated with visuospatial cognitive functions.”

Again, these subjects were homosexual, that’s a confounding variable. These differences can be caused by environment, girls who are diagnosed with gender dysphoria are gender nonconforming and have been raised to believe that the things that they enjoy are only natural for males. There’s no evidence they were born with “masculinization of brain structures associated with visuospatial cognitive functions,” or that those structures would have developed to become “masculinized” without the child being exposed to gendered socialization.

Structural Connectivity Networks of Transgender People

“Specifically, our data suggest that network parameters may reflect unique characteristics of transgender patients, whereas local physiological aspects have been shown to represent the transition from the biological sex to the actual gender identity.”

Trans identified people have a lot of things in common with each other outside of being trans identified, including high co-morbidity of other psychiatric disorders and similar general life experiences. This doesn’t prove that gender identity exists as an innate characteristic. Think about it, if trans people have unique characteristics that are not seen in their “cis” counterparts, doesn’t that suggest that those “cis” people don’t have gender identities and only trans people do? And that those gender identities are just the manifestation of dysphoria? The idea that every single person has a gender identity is not supported by only trans people having these characteristics.

A sex difference in the human brain and its relation to transsexuality.

This study is from 1995.

“A female-sized BSTc was found in male-to-female transsexuals.”

The stria terminalis is a plastic structure, there’s no evidence the subjects were born with a “female-sized BSTc” and, there’s also no evidence that male and female brains are differentiated at birth in the first place. What we consider to be a “female-sized BSTc” could very well be “the size that your BTSc tends to be if you are raised to consider your tastes and preferences to be female”