Facts : https://www.aclu.org/legal-doc...

Be warned, pages of citations to reputable medical journals, actual science rather than "what everyone knows" assertions. Perhaps after spending a few hours, or days, reading through them you might re consider your views.

Apparently it isn't though,

White matter microstructure in female to male transsexuals before cross-sex hormonal treatment. A diffusion tensor imaging study. - Rametti et al, J Psychiatr Res. 2010 Jun 8.

        CONCLUSIONS: Our results show that the white matter microstructure pattern in untreated FtM transsexuals is closer to the pattern of subjects who share their gender identity (males) than those who share their biological sex (females). Our results provide evidence for an inherent difference in the brain structure of FtM transsexuals

Maybe this will help explain:

Sexual Hormones and the Brain: An Essential Alliance for Sexual Identity and Sexual Orientation Garcia-Falgueras A, Swaab DF Endocr Dev. 2010;17:22-35

The fetal brain develops during the intrauterine period in the male direction through a direct action of testosterone on the developing nerve cells, or in the female direction through the absence of this hormone surge. In this way, our gender identity (the conviction of belonging to the male or female gender) and sexual orientation are programmed or organized into our brain structures when we are still in the womb. However, since sexual differentiation of the genitals takes place in the first two months of pregnancy and sexual differentiation of the brain starts in the second half of pregnancy, these two processes can be influenced independently, which may result in extreme cases in trans-sexuality. This also means that in the event of ambiguous sex at birth, the degree of masculinization of the genitals may not reflect the degree of masculinization of the brain. There is no indication that social environment after birth has an effect on gender identity or sexual orientation,

TLDR; Trans people have the neurology of the gender they say they are.

This is objectively observable on MRI and PET scans, so to say this is a "mental disorder" or commies trying to pollute our precious bodily fluids is, you know, Reality Chellenged. Trumpian.

See also Male–to–female transsexuals have female neuron numbers in a limbic nucleus. Kruiver et al J Clin Endocrinol Metab (2000) 85:2034–2041 and a couple of hundred other papers on the subject.

The present findings of somatostatin neuronal sex differences in the BSTc and its sex reversal in the transsexual brain clearly support the paradigm that in transsexuals sexual differentiation of the brain and genitals may go into opposite directions...

Oh no. not this again..
1 in 300 men don't have 46.XY chromosomes. Some women do. Sometimes, rarely, so do the daughters they give birth to.

See J Clin Endocrinol Metab. 2008 Jan;93(1):182-9

A 46,XY mother who developed as a normal woman underwent spontaneous puberty, reached menarche, menstruated regularly, experienced two unassisted pregnancies, and gave birth to a 46,XY daughter with complete gonadal dysgenesis.

Fortunately this is Slashdot, where people who know stuff don't mind sharing basic biological info for the n+1th time. as a lot of schools only teach the simplified kiddies version of biology. even to really bright students. The kind you find on Slashdot.

Sourcecode

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CSOnline

Interesting. I ask you some discomfiting questions, you interpret that as bigotry.

Please try answering them instead? Or you may give others the wrong impression.

I agree - but it may not be the one assigned to you at birth.

Gender change in 46,XY persons with 5alpha-reductase-2 deficiency and 17beta-hydroxysteroid dehydrogenase-3 deficiency. Cohen-Kettenis PT. Arch Sex Behav. 2005 Aug;34(4):399-410.
  Individuals with 5alpha-reductase-2 deficiency (5alpha-RD-2) and 17beta-hydroxysteroid dehydrogenase-3 deficiency (17beta-HSD-3) are often raised as girls. Over the past number of years, this policy has been challenged because many individuals with these conditions develop a male gender identity and make a gender role change after puberty.
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That's because they have a natural FtoM sex change.

See http://www.usrf.org/news/010308-guevedoces.html

Things are perhaps a tiny bit more complex than your dogmatic statement allows.

Not 99.999%. About 99.7%. 1 in 300 men aren't 46,XY. Some women are. 1 in 450 men are 47,XXY. etc.

Welcome to womanhood. You were a girl who looked like a boy. Now that's changing.

It gets better too

If you want to know why you're like this - there's two papers you should read.

Sexual Hormones and the Brain: An Essential Alliance for Sexual Identity and Sexual Orientation Garcia-Falgueras A, Swaab DF Endocr Dev. 2010;17:22-35

The fetal brain develops during the intrauterine period in the male direction through a direct action of testosterone on the developing nerve cells, or in the female direction through the absence of this hormone surge. In this way, our gender identity (the conviction of belonging to the male or female gender) and sexual orientation are programmed or organized into our brain structures when we are still in the womb. However, since sexual differentiation of the genitals takes place in the first two months of pregnancy and sexual differentiation of the brain starts in the second half of pregnancy, these two processes can be influenced independently, which may result in extreme cases in trans-sexuality. This also means that in the event of ambiguous sex at birth, the degree of masculinization of the genitals may not reflect the degree of masculinization of the brain. There is no indication that social environment after birth has an effect on gender identity or sexual orientation.

Biased-Interaction Theory of Psychosexual Development: “How Does One Know if One is Male or Female?” M.Diamond Sex Roles (2006) 55:589–600

A theory of gender development is presented that incorporates early biological factors that organize predispositions in temperament and attitudes. With activation of these factors a person interacts in society and comes to identify as male or female. The predispositions establish preferences and aversions the growing child compares with those of others. All individuals compare themselves with others deciding who they are like (same) and with whom are they different. These experiences and interpretations can then be said to determine how one comes to identify as male or female, man or woman. In retrospect, one can say the person has a gendered brain since it is the brain that structures the individual’s basic personality; first with inherent tendencies then with interactions coming from experience.

Your reported experience before age 10 matches my own pretty closely, BTW. It's a common pattern, one shared by women with CAH.

Up until age 5, I was a child. No real concept of gender.

At 6, I went to school, and noticed something was wrong. I was dressed as a boy, I looked like a boy, but I didn't think like "other boys". I still liked toy guns, and Meccano rather than dolls, but I was different.

At 7, I knew I wasn't a boy, but didn't know what I was. I thought boys were puerile, and girls too silly and sissy. A classic Tomboy in retrospect.

At 8, I got to play hopscotch with other girls, and I felt at home. They thought like I did, they cried like I did. I still didn't see myself as more than an honourary girl though. Even if my favourite toy car was Lady Penelope's pink Rolls-Royce.

At 9, more by a process of elimination than anything else, I realised I was female. Boys could just as well have been an alien species. Girls were just like me, in feelings and values.

At 10, I was in a boys boarding school then, and I was able to make up boardgames of astounding complexity when it rained. I had my own secret garden in the nearby woods, with flowerbeds I'd planted. I could sit and read amidst the flowers, and was terribly happy. It was then I picked the name Zoe, and planned what I was going to do with my life. I wanted children, a husband, the white picket fence etc, but also to be a Rocket Scientist and to travel the world, things that Wives and Mothers Just Did Not Do in the 60's.

Even though it had been obvious since age 7 that I’d never be “svelte” or “petite”, that I’d be the girl “with the wonderful personality”. I didn’t cry about that – much. And not where anyone could see me. I was more worried about the practical problems I'd be having when I started having a female puberty. And vaguely concerned that boys didn't interest me at all. I was no naive I thought that was part of the package of being a girl. Was I a defective one?

It came as a terrible shock when I learnt that boys and girls are born looking different, and that my body was boy.

I didn’t take it well.

Basically, I failed my SAN roll, and convinced myself I had to be a boy, no matter how I felt inside. That meant forgetting a lot, suppressing memories, but it was either acquire a minor psychosis, or sink into despair, depression, and death.

A part of me still knew, but that part was in a box in a safe in the hold of a sunken ship at the bottom of the ocean on a planet circling a distant star.

I tried to be the best Man any woman could be. I did that for 47 years. It helped to be Asexual, mildly lesbian if anything.

Probably

From the Grauniad June 16 2008:

Striking similarities between the brains of gay men and straight women have been discovered by neuroscientists, offering fresh evidence that sexual orientation is hardwired into our neural circuitry.

Scans reveal homosexual men and heterosexual women have symmetrical brains, with the right and left hemispheres almost exactly the same size. Conversely, lesbians and straight men have asymmetrical brains, with the right hemisphere significantly larger than the left.

Scientists at the prestigious Stockholm Brain Institute in Sweden also found certain brain circuits linked to emotional responses were the same in gay men and straight women.

The findings, published tomorrow in the US journal Proceedings of the National Academy of Sciences, suggest the biological factors that influence sexual orientation - such as exposure to testosterone in the womb - may also shape the brain's anatomy.

The study, led by the neurobiologist Ivanka Savic, builds on previous research that has identified differences in spatial and verbal abilities related to sex and sexual orientation. Tests have found gay men and straight women fare better at certain language tasks, while heterosexual men and lesbians tend to have better spatial awareness.