-I don't want to _define_ gender based on psychology.[ref]Also, on a personal note, can I remark on how _weird_ and _uncomfortable_ it is that defending psychological sex differences has now apparently become my thing? I'm an individualist/egalitarian androgyny fan, not a [complementarian](https://en.wikipedia.org/wiki/Complementarianism); I [_don't want_](http://unremediatedgender.space/2017/Dec/theres-a-land-that-i-see-or-the-spirit-of-intervention/) women and men to have incommensurable souls. But faced with an intellectual climate where brilliant, kind, otherwise-sane people seem to feel morally obligated to _destroy our collective ability to reason about sex using natural language_, I feel morally obligated to not let them get away with it. Not for love of the territory in its current state, but for the love of that property of maps that _reflect_ the territory.[/ref] ([Definitions are overrated](https://www.lesswrong.com/posts/cFzC996D7Jjds3vS9/arguing-by-definition), anyway.) I do think that biological sex is almost as close as you can get to being a _natural category_[ref]The [chemical elements](https://en.wikipedia.org/wiki/List_of_chemical_elements) would be an example of an even more robustly natural category. Atoms with more protons than nitrogen but fewer than oxygen _do not exist_, and thus there is no analogue in chemistry to the "Well, what about intersex conditions?" [challenge](http://geekfeminism.wikia.com/wiki/Derailment) to the concept of sex or the "Well, what about [ring species](https://en.wikipedia.org/wiki/Ring_species)?" challenge to the concept of species.[/ref] in something like the following sense. If we imagine a distribution of artificial intelligences studying life on Earth and humans in particular, but lacking any preconceived concept of _sex_,[ref]It would be more traditional to put aliens rather than AIs in the observer role of this genre of thought experiment, but evolved aliens probably _would_ already know about sex![/ref] different AIs would each invent [different concepts](https://www.lesswrong.com/posts/XeHYXXTGRuDrhk5XL/unnatural-categories) in order to model the aspects of reality relevant to their own individual values, but most of them would be forced to reinvent the category of _sex_ sooner or later, because sex category membership makes predictions about [_many_ different dimensions of observation](https://en.wikipedia.org/wiki/Sex_differences_in_humans)—although some with much larger [or smaller](https://www.apa.org/pubs/journals/releases/amp-606581.pdf) effect sizes than others—at least _some_ of which are likely to be relevant to the interests of any particular AI that's paying any attention to animal life at _all_.
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-[I use the "bimodal multivariate distribution" frame a lot—it's even in the URL—but it's actually worse: sex-specific adaptations—functional adaptations and not just shifted distributions—are a thing https://thingofthings.wordpress.com/2017/05/05/the-cluster-structure-of-genderspace/]
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-[if you have to do definitions, you go by physiology, because that's the part that's truly almost-completely-binary]
+I don't want to _define_ gender based on psychology. ([Definitions are overrated](https://www.lesswrong.com/posts/cFzC996D7Jjds3vS9/arguing-by-definition), anyway.)[ref]Also, on a personal note, can I remark on how _weird_ and _uncomfortable_ it is that defending psychological sex differences has now apparently become my thing? I'm an individualist/egalitarian androgyny fan, not a [complementarian](https://en.wikipedia.org/wiki/Complementarianism); I [_don't want_](http://unremediatedgender.space/2017/Dec/theres-a-land-that-i-see-or-the-spirit-of-intervention/) women and men to have incommensurable souls. But faced with an intellectual climate where brilliant, kind, otherwise-sane people seem to feel morally obligated to _destroy our collective ability to reason about sex using natural language_, I feel morally obligated to not let them get away with it. Not for love of the territory in its current state, but for the love of that property of maps that _reflect_ the territory.[/ref] I do think that biological sex is almost as close as you can get to being a _natural category_[ref]The [chemical elements](https://en.wikipedia.org/wiki/List_of_chemical_elements) would be an example of an even more robustly natural category. Atoms with more protons than nitrogen but fewer than oxygen _do not exist_, and thus there is no analogue in chemistry to the "Well, what about intersex conditions?" [challenge](http://geekfeminism.wikia.com/wiki/Derailment) to the concept of sex or the "Well, what about [ring species](https://en.wikipedia.org/wiki/Ring_species)?" challenge to the concept of species.[/ref] in something like the following sense. If we imagine a distribution of artificial intelligences studying life on Earth and humans in particular, but lacking any preconceived concept of _sex_,[ref]It would be more traditional to put aliens rather than AIs in the observer role of this genre of thought experiment, but evolved aliens probably _would_ already know about sex![/ref] different AIs would each invent [different concepts](https://www.lesswrong.com/posts/XeHYXXTGRuDrhk5XL/unnatural-categories) in order to model the aspects of reality relevant to their own individual values, but most of them would be forced to reinvent the category of _sex_ sooner or later, because sex category membership [makes predictions about _many_](https://en.wikipedia.org/wiki/Sex_differences_in_humans) different [dimensions of observation](https://thingofthings.wordpress.com/2017/05/05/the-cluster-structure-of-genderspace/)—although some with much larger [or smaller](https://www.apa.org/pubs/journals/releases/amp-606581.pdf) effect sizes than others—at least _some_ of which are likely to be relevant to the interests of any particular AI that's paying any attention to animal life at _all_.