+Okay, so trans people aren't delusional about their [developmental sex](/2019/Sep/terminology-proposal-developmental-sex/); the claim is that their internal sense of their own gender is in some sense more real or more relevant and should take precedence.
+
+So where does that leave me? This post is about my _own_ experiences, and not anyone else's (which I obviously don't have access to). I've _mentioned_ transgenderedness a number of times in the main body of this post, but I've tried to cast it as explanation that one might be tempted to apply to my case, but which I don't think fits. Everything I've said so far is _consistent_ with a world in which Ray Blanchard (who coined the obvious and perfect word for my thing while studying actual transsexuals) was dumb and wrong, a world where my idiosyncratic weird sex perversion and associated beautiful pure sacred self-identity feelings are taxonomically and etiologically distinct from whatever brain-intersex condition causes _actual_ trans women. That's the world I _thought_ I lived in for the ten years after encountering the obvious and perfect word.
+
+My first clue that I wasn't living in that world came from—Eliezer Yudkowsky. In [a 26 March 2016 Facebook post](https://www.facebook.com/yudkowsky/posts/10154078468809228), he wrote—
+
+> I'm not sure if the following generalization extends to all genetic backgrounds and childhood nutritional backgrounds. There are various ongoing arguments about estrogenlike chemicals in the environment, and those may not be present in every country...
+
+> Still, for people roughly similar to the Bay Area / European mix, I think I'm over 50% probability at this point that at least 20% of the ones with penises are actually women.
+
+(***!?!?!?!?***)
+
+> A lot of them don't know it or wouldn't care, because they're female-minds-in-male-bodies but also cis-by-default (lots of women wouldn't be particularly disturbed if they had a male body; the ones we know as 'trans' are just the ones with unusually strong female gender identities). Or they don't know it because they haven't heard in detail what it feels like to be gender dysphoric, and haven't realized 'oh hey that's me'. See, e.g., <https://sinesalvatorem.tumblr.com/post/141690601086/15-regarding-the-4chan-thing-4chans> and <https://slatestarcodex.com/2013/02/18/typical-mind-and-gender-identity/>
+
+(Reading _this_ post, I _did_ realize "oh hey that's me"—it's hard to believe that I'm not one of the "20% of the ones with penises" Yudkowsky is talking about here—but I wasn't sure how to reconcile that with the "are actually women" (***!?!?!?!?***) characterization, coming _specifically_ from the guy who taught me (in "Changing Emotions") how blatantly, ludicrously untrue and impossible that is.)
+
+> But I'm kinda getting the impression that when you do normalize transgender generally and MtF particularly, like not "I support that in theory!" normalize but "Oh hey a few of my friends are transitioning and nothing bad happened to them", there's a _hell_ of a lot of people who come out as trans.
+
+> If that starts to scale up, we might see a really, really interesting moral panic in 5-10 years or so. I mean, if you thought gay marriage was causing a moral panic, you just wait and see what comes next ...
+
+Indeed—here we are just 4¾ years later, and _I am panicking_. (As 2007–9 Sequences-era Yudkowsky [taught me](https://www.yudkowsky.net/other/fiction/the-sword-of-good), and 2016 Facebook-shitposting-era Yudkowsky seemed to ignore, the thing that makes a moral panic really interesting is how hard it is to know you're on the right side of it—and the importance of [panicking sideways](https://www.lesswrong.com/posts/erGipespbbzdG5zYb/the-third-alternative) [in policyspace](https://www.overcomingbias.com/2007/05/policy_tugowar.html) when the "maximize the number of trans people" and "minimize the number of trans people" coalitions are both wrong.)
+
+At the time, this was merely _very confusing_. I left a careful comment in the Facebook thread (with the obligatory "speaking only for myself; I obviously know that I can't say anything about anyone else's experience" [disclaimer](https://www.overcomingbias.com/2008/06/against-disclai.html)), quietly puzzled at what Yudkowsky could _possibly_ be thinking ...
+
+A month later, I moved out of my mom's house in Walnut Creek to go live with a new roommate in an apartment on the correct side of the [Caldecott tunnel](https://en.wikipedia.org/wiki/Caldecott_Tunnel), in Berkeley: closer to other people in the robot-cult scene and with a shorter train ride to my coding dayjob in San Francisco.
+
+(I would later change my mind about which side of the tunnel is the correct one.)
+
+In Berkeley, I met a number of really interesting people who seemed quite similar to me along a lot of dimensions, but also very different along some other dimensions having to do with how they were currently living their life! (I see where the pattern-matching facilities in Yudkowsky's brain got that 20% from.) This prompted me to do a little bit more reading in some corners of the literature that I had certainly _heard of_, but hadn't already mastered and taken seriously in the previous twelve years of reading everything I could about sex and gender and transgender and feminism and evopsych. (Kay Brown's blog, [_On the Science of Changing Sex_](https://sillyolme.wordpress.com/), was especially helpful.)
+
+Between the reading, and a series of increasingly frustrating private conversations, I gradually became persuaded that Blanchard _wasn't_ dumb and wrong, that his taxonomy is _basically_ correct, at least as a first approximation. So far this post has just been about _my_ experience, and not anyone's theory of transsexualism (which I had assumed for years couldn't possibly apply to me), so let me take a moment to explain the theory now.
+
+(With the understanding that psychology is complicated and there's more to be said about what "as a first approximation" is even supposed to mean, but I need a few paragraphs to talk about the simple story before I can get to that.)
+
+The idea is that male-to-female transsexualism isn't actually one phenomenon; it's two completely different phenomena that don't actually have anything to do with each other, except for the indicated treatment (HRT, surgery, social transition).
+
+In one taxon, the "early-onset" type, you have same-sex-attracted males who have just been extremely feminine (in social behavior, interests, _&c._) their entire lives, in a way that causes huge social problems for them—the far tail of feminine gay men who end up fitting into the world better as straight women. _That's_ where the "woman trapped inside a man's body" trope comes from. [This one probably _is_ a brain-intersex condition.](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3180619/)
+
+That story is pretty intuitive. Were an alien AI to be informed of the fact that, among humans, some fraction of males elect to undergo medical interventions to resememble females, and aspire to be perceived as females socially, "brain-intersex condition such that they already behave like females" would probably be its top hypothesis for the cause of such behavior, just on priors.
+
+Suppose our alien AI were to be informed that many of the human males seeking to become female (as far as the technology can manage, anyway) do _not_ fit this profile. If you [didn't have enough data to _prove_ anything, but you had to guess](https://www.lesswrong.com/posts/xTyuQ3cgsPjifr7oj/faster-than-science), what would be your _second_ hypothesis for how this behavior might arise?