But if you saw this person on the street or even slept in their bed, you wouldn't want to call them a woman, because everything about them that you can observe looks like that of an adult human male. If you're not a reproductive health lab tech and don't look at the photographs in biology textbooks, you'll never _see_ the gametes someone's body produces. (You can see male semen, but the individual spermatozoa are too small to look at without a microscope; people [didn't even know that ova and sperm _existed_ until the 17th century](https://onlinelibrary.wiley.com/doi/full/10.1111/j.1439-0531.2012.02105.x).) Does that mean this common definition of _female_ isn't perfectly serviceable after all?
-No, because humans whose gametes produce eggs but appear male in every other aspect, are something I just made up out of thin air for the purposes of this blog post; they don't exist in the real world. What this really shows is that the cognitive technology of "words" having "definitions" doesn't work in _the world of the imagination_, because _the world of the imagination_ encompasses (at a minimum) _all possible configurations of matter_. Words are [short messages that compress a lot of information](https://www.lesswrong.com/posts/mB95aqTSJLNR9YyjH/message-length), but what it _means_ for the world to contain information is that some things in the world are more probable than others.
+No, because humans whose gonads produce eggs but appear male in every other aspect, are something I just made up out of thin air for the purposes of this blog post; they don't exist in the real world. What this really shows is that the cognitive technology of "words" having "definitions" doesn't work in _the world of the imagination_, because _the world of the imagination_ encompasses (at a minimum) _all possible configurations of matter_. Words are [short messages that compress a lot of information](https://www.lesswrong.com/posts/mB95aqTSJLNR9YyjH/message-length), but what it _means_ for the world to contain information is that some things in the world are more probable than others.
To see why, let's take a brief math detour and review some elementary information theory. Instead of the messy real world, take a restricted setting: the world of strings of 20 bits. Suppose you wanted to devise an efficient _code_ to represent elements of this world with _shorter_ strings, such that you could say (for example) `01100` (in the efficient code, using just 5 bits) and the people listening to you would know that what you actually saw in the world was (for example) `01100001110110000010`.
Then if you wanted an efficient encoding to talk about the two and only two _clusters_ of bitstrings—the mostly-zeros (a majority of `00000000000000000000` plus a few exceptions with a few bits flipped) and the mostly-ones (a majority of `11111111111111111111` plus a few exceptions with a few bits flipped)—you might want to use the first bit as the "definition" for your codewords—even if most of the various [probabilistic inferences that you wanted to make](https://www.lesswrong.com/posts/3nxs2WYDGzJbzcLMp/words-as-hidden-inferences) [on the basis of cluster-membership](https://www.lesswrong.com/posts/gDWvLicHhcMfGmwaK/conditional-independence-and-naive-bayes) concerned bits other than the first. The majoritarian first bit, even if you don't care about it in itself, is a [_simple_ membership test](https://www.lesswrong.com/posts/edEXi4SpkXfvaX42j/schelling-categories-and-simple-membership-tests) for the mostly-zeros/mostly-ones category system.
-Unfortunately—_deeply_ unfortunately—this is not a math blog. (I _wish_ this were a math blog—I wish I lived in a world where I could do math blogging for the greater glory of our collective understanding of reality, [rather than being condemned](TODO: linky "A Previous Life's War") to gender blogging in self-defense, hopelessly outgunned, outmanned, outnumbered, outplanned [in a Total Culture War](/2020/Feb/if-in-some-smothering-dreams-you-too-could-pace/) over the future of [my neurotype-demographic](/2021/May/sexual-dimorphism-in-the-sequences-in-relation-to-my-gender-problems/).) So, having briefly explained the theory, let's get back to the dreary, how do you say—_application_.
+Unfortunately—_deeply_ unfortunately—this is not a math blog. (I _wish_ this were a math blog—I wish I lived in a world where I could do math blogging for the greater glory of our collective understanding of reality, rather than being condemned to gender blogging in self-defense, hopelessly outgunned, outmanned, outnumbered, outplanned [in a Total Culture War](/2020/Feb/if-in-some-smothering-dreams-you-too-could-pace/) over the future of [my neurotype-demographic](/2021/May/sexual-dimorphism-in-the-sequences-in-relation-to-my-gender-problems/).) So, having briefly explained the theory, let's get back to the dreary, how do you say—_application_.
-Defining sex in terms of gamete size or genitals or chromosomes is like the using the never-flipped first bit in our abstract example about the world of length-20 bitstrings. It's not that people _directly_ care about gametes or chromosomes or even gentials in most everyday situations. (You're probably not directly trying to mate with most of the people you meet in everyday situations, and sex chromosomes weren't discovered until the _20th_ century.) It's that that these are _discrete_ features that are entangled with everything _else_ that differs between females and males, including many [correlated](https://www.lesswrong.com/posts/cu7YY7WdgJBs3DpmJ/the-univariate-fallacy-1) statistical differences of various [effect sizes](/2019/Sep/does-general-intelligence-deflate-standardized-effect-sizes-of-cognitive-sex-differences/), and differences that are harder to articulate or measure, and differences that haven't even been discovered yet (as gametes and chromosomes hadn't respectively been discovered yet in the 16th and 20th centuries) but can be theorized to exist because _sex_ is a very robust abstraction that you need in order to understand the design of evolved biological creatures.
+Defining sex in terms of gamete size or genitals or chromosomes is like the using the never-flipped first bit in our abstract example about the world of length-20 bitstrings. It's not that people _directly_ care about gametes or chromosomes or even gentials in most everyday situations. (You're probably not directly trying to mate with most of the people you meet in everyday situations, and sex chromosomes weren't discovered until the _20th_ century.) It's that that these are _discrete_ features that are entangled with everything _else_ that differs between females and males—including many [correlated](https://www.lesswrong.com/posts/cu7YY7WdgJBs3DpmJ/the-univariate-fallacy-1) statistical differences of various [effect sizes](/2019/Sep/does-general-intelligence-deflate-standardized-effect-sizes-of-cognitive-sex-differences/), and differences that are harder to articulate or measure, and differences that haven't even been discovered yet (as gametes and chromosomes hadn't respectively been discovered yet in the 16th and 20th centuries) but can be theorized to exist because _sex_ is a very robust abstraction that you need in order to understand the design of evolved biological creatures.
-Discrete features make for better word _definitions_ than high-dimensional statistical regularities, even if most of the everyday inferential utility of _using_ the word comes from the high-dimensional statistical stuff. A dictionary definition is just a helpful pointer to help people pick out "the same" [natural abstraction](https://www.lesswrong.com/posts/cy3BhHrGinZCp3LXE/testing-the-natural-abstraction-hypothesis-project-intro) in their _own_ world-model.
+Discrete features make for better word _definitions_ than high-dimensional statistical regularities, even if most of the everyday inferential utility of _using_ the word comes from the high-dimensional statistical correlates. A dictionary definition is just a helpful pointer to help people pick out "the same" [natural abstraction](https://www.lesswrong.com/posts/cy3BhHrGinZCp3LXE/testing-the-natural-abstraction-hypothesis-project-intro) in their _own_ world-model.
(Gamete size is a particularly good definition for the natural category of _sex_ because the concept of [anisogamy](https://en.wikipedia.org/wiki/Anisogamy) generalizes across species that have different sex determination systems or configurations or sexual anatomy. In birds, [the presence or absence of a _W_ chromosome determines whether an animal is _female_](https://en.wikipedia.org/wiki/ZW_sex-determination_system), in contrast [the _Y_ chromosome's determination of maleness in mammals](https://en.wikipedia.org/wiki/XY_sex-determination_system), and some reptiles' sex is determined by [the temperature of an lain egg while it develops](https://en.wikipedia.org/wiki/Temperature-dependent_sex_determination) (!). And let's not get started on the [cloaca](https://en.wikipedia.org/wiki/Cloaca).)
-But because our brains are good at using a sex-category words to simultaneously encode predictions about _both_ absolute discrete differences and high-dimensional statistical regularities of various effect sizes, without our being consciously aware of the cognitive work being done, it's easy to get confused by verbal gymnastics if you don't know the theory.
+But because our brains are good at using sex-category words to simultaneously encode predictions about _both_ absolute discrete differences and high-dimensional statistical regularities of various effect sizes, without our being consciously aware of the cognitive work being done, it's easy to get confused by verbal gymnastics if you don't know the theory.
-I sometimes regret that so many of my attempts to talk about trans issues end up focusing on psychological sex differences. I guess I'm used to it now, but at first, this was a very weird position for me to be in! (For a long time, I [really didn't want to believe in psychological sex differences](/2021/May/sexual-dimorphism-in-the-sequences-in-relation-to-my-gender-problems/#antisexism).) But it keeps happening because it's a natural thing to _disagree_ about: the anatomy of pre-op trans women is not really in _dispute_, so the sex realist's contextual reply to "Why do you care what genitals someone might or might not have under their clothes?" often ends up appealing to psychology, to which the trans advocate can reply, "Oh, you want to define gender based on psychology, then? But then the logic of your position forces you to conclude that butch lesbians aren't women! _Reductio ad absurdum!_" [TODO: link Ozy]
+I sometimes regret that so many of my attempts to talk about trans issues end up focusing on psychological sex differences. I guess I'm used to it now, but at first, this was a very weird position for me to be in! (For a long time, I [really didn't want to believe in psychological sex differences](/2021/May/sexual-dimorphism-in-the-sequences-in-relation-to-my-gender-problems/#antisexism).) But it keeps happening because it's a natural thing to _disagree_ about: the anatomy of pre-op trans women is not really in _dispute_, so the sex realist's contextual reply to "Why do you care what genitals someone might or might not have under their clothes?" often ends up appealing to some psychological dimension or another, to which the trans advocate [can counterreply](https://thingofthings.wordpress.com/2018/06/18/man-should-allocate-some-more-categories/), "Oh, you want to define gender based on psychology, then? But then the logic of your position forces you to conclude that butch lesbians aren't women! _Reductio ad absurdum!_"
-This is a severe misreading of the sex-realist position. No one wants to _define_ "gender" based on psychology.
-
-You can't coerce reality into changing by choosing different definitions!
-
-There's _already_ a multivariate distribution of bodies and minds in the world, and we
+This is a severe misreading of the sex-realist position. No one wants to _define_ "gender" based on psychology. You can't coerce reality into changing by choosing different definitions! Rather, there's _already_ a multivariate distribution of bodies and minds in the world, and good definition choices help us coordinate the concepts in different people's heads into a _shared_ map of that territory.
+_One_ of the _many_ distinctions people sometimes want to make when thinking about the multivariate distribution of bodies and minds in the world, is that between the sexes. Sex is by no means the only way in which people differ! In many situations you might want to categorize or describe people in many different ways, some more or less discrete _versus_ categorical, or high- _versus_ low-dimensional: age or race or religion or social class or intelligence or agreeableness or
+To deconfuse yourself,
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