+Notice that this is an _empirical_ argument for why successfully-socially-transitioned trans people fit into _existing_ concepts of (social) gender, not a redefinition of words by fiat in order to avoid hurting someone's feelings. To the extent that any of the claims _fail_ to be true of self-identified trans people or some subset thereof—to the extent that physical transition _isn't_ effective, to the extent that people _do_ have legitimate use-cases for biological-sex classifications that aren't "fooled" by hormones and surgery—then the conclusion is correspondingly weakened.
+
+Let's consider some of what is known about trans women. (For the remainder of this post, I'm going to focus on trans women, for reasons of personal interest. The task of analyzing the situation of trans men is left to the interested reader.)
+
+While a minority of trans women in Western countries fit the "classical transsexual" profile of being attracted to men, displaying
+
+(To interested readers who only have time to read one paper, I recommend Anne Lawrence's ["Autogynephilia and the Typology of Male-to-Female Transsexualism: Concepts and Controversies"](http://unremediatedgender.space/papers/lawrence-agp_and_typology.pdf) For a more exhaustive treatment, see Lawrence's book [_Men Trapped in Men's Bodies_](https://surveyanon.files.wordpress.com/2017/07/men-trapped-in-mens-bodies_book.pdf) or follow the links and citations in [Kay Brown's FAQ](https://sillyolme.wordpress.com/faq-on-the-science/).)
+
+
+
+-----
+
+[_woman_ is a top-20 noun](https://en.wikipedia.org/wiki/Most_common_words_in_English#Nouns).
+
+[explain two-type taxonomy; [single paper rec]]
+
+[caveats: take care to note that it's possible to believe in a weaker form of it: maybe you agree to the bimodality in the data, but don't think it's two discrete etiological types; or, maybe you [agree that there are two etiologies, but](https://thingofthings.wordpress.com/2017/04/18/against-blanchardianism/) don't buy that AGP is the cause]
+
+[note that I'm focusing on MtF because of reasons; analyzing the situation with trans men is left as an exercise to the interested reader]
+
+In less tolerant places and decades, where transsexuals were very rare and had to try very hard to pass as women out of dire necessity, their impact on the social order and how people think about gender was minimal—there were just too few trans people to make much of a difference.
+
+Nowadays, in progressive enclaves of Western countries, this is no longer true, and in communities that form around [non-sex-balanced interests](http://slatestarcodex.com/2017/08/07/contra-grant-on-exaggerated-differences/), the numbers can be quite dramatic. For example, on the 2018 _Slate Star Codex_ reader survey, 9.4% responded _F (cisgender)_ to the gender question, compared to 1.4% responding _F (transgender m -> f)_. So, if trans women are women, _13.4%_ (!!) of female _Slate Star Codex_ readers are trans.
+
+A (cis) female friend of the blog, a member of the Berkeley, California rationalist community reports on recent changes in local social norms—
+
+> There have been "all women" things, like clothing swaps or groups, that then pre-transitioned trans women show up to. And it's hard, because it's weird and uncomfortable once three or four participants of twelve are trans women. I think the reality that's happening is women are having those spaces less—instead doing private things "for friends," with specific invite lists that are implicitly understood not to include men or trans women. This sucks because then we can't include women who aren't _already_ in our social circle, and we all know it but no one wants to say it.
+
+This is a _terrible_ outcome with respect to _everyone's_ values. One couldn't even say, "The cost to bigoted cis women of not being able to have trans-exclusionary spaces is more than outweighed by trans women's identities being respected," b
+
+
+
+Depending on your values, of course, you might be in favor of making it socially unacceptable to have sex-segregated spaces that are actually segregated by biological sex. The methods of rationality themselves have nothing to say on the matter.
+
+To only say, "What's the problem? Trans women are women, by definition, and definitions can't be wrong" is to invite the reply, "That's not what I meant _and you fucking know it._"