+One might counterargue that this is unjustifiably assuming "biologically female" as a primitive. The author seems to endorse a critique along these lines as the first of three objections to the "adult human female" criterion of womanhood—
+
+> 1) The way we draw categories in biology is a social decision we make for social and cultural reasons, it isn’t a feature of the biology itself. A different sort of society might categorize infertile humans as a separate gender, for example, and that'd be as justified by the biology as our system. Or have 'prepubescent' be a gender, or 'having living offspring' be a gender—there are a million things that these categories could just as reasonably, from the biology, have been drawn around.
+
+I've addressed this class of argument at length (about 7500 words) in a previous post, ["The Categories Were Made for Man to Make Predictions"](http://unremediatedgender.space/2018/Feb/the-categories-were-made-for-man-to-make-predictions/), but to summarize _briefly_, while I _agree_ that categories can be defined in many ways to suit different cultural priorities, not all possible categories are equally useful, because the cognitive function of categories is to group similar things together so that we can make similar predictions about them.
+
+A free-thinking biologist certainly _could_ choose to reject the othrodoxy of grouping living things by ancestry and reproductive isolation and instead choose to study living things that are yellow, but her treatises would probably be difficult to follow, because "living things that are yellow" is instrinsically a much less cohesive subject matter than, say, "birds": experience with black crows is probably going to be _more_ useful when studying yellow canaries than experience with yellow daffodills—even if, in all philosophical strictness, there are a million things that these categories could have been drawn around, and who can say but that some other culture's biologists might have chosen color rather than ancestry as the true determinant of "species"?
+
+It is of course true that different cultures will place different emphases and interpretations on various ways in which people can differ: being prepubescent or a parent might have special significance in some cultures that outsiders could never understand. But to say that prepubescents might as well be a "gender"—well, at this point I must confess that I'm really not sure what this "gender" thing is the author is trying to talk about.
+
+And I guess that's the problem. People who favor the "adult human female" definition of _women_ aren't trying to invalidate anyone's "gender"; they're trying to talk about _biological sex_ using simple, universally-understood words. Biological sex is obviously not the only category in the world—in a lot of situations, you might care more about whether someone has living children—or for that matter, whether an organism is yellow—than what sex it is.
+
+But when people _do_ want to talk about sex—when they want to carve reality along that _particular_ joint, without denying that there are [superexponentially](https://www.lesswrong.com/posts/82eMd5KLiJ5Z6rTrr/superexponential-conceptspace-and-simple-words) many others in the vastness of configuration space—there's something _profoundly frustrating_ about Blue Tribe culture's unshakeable insistence that certain inferences _must not_ be made, that certain conceptual distinctions must not be _expressible_, except perhaps cloaked behind polysyllabic obfuscations like "assigned sex at birth" (as if the doctors made a _mistake_!).
+
+Consider these fictional (but, I fear, all too realistic) dialogues—
+
+[TODO: some sort of medical/reproduction dialogue here]
+
+**Alice**: I think it was _terribly_ unfair how that state high school track championship was won by a male-to-female transgender person who wasn't even on hormone replacement therapy!
+**Bob**: I don't see the problem. It's a girl's track meet. Trans girls _are_ girls, _by definition_. On what grounds could anyone possibly object?
+**Alice**: ...
+
+**Alice**: I'm sad that the sex ratio of my local decision-theory and compiler-development unified meetup group is so lopsided!
+**Bob**: What do you mean? There were lots of women at that meetup!
+**Alice**: Yeah, but literally all of us were trans.
+**Bob**: So?
+**Alice**: ...
+
+**Alice**: Have you seen this [the Sweedish cohort study in which MtF violent crime rate was similar to that of men]
+**Bob**: [O terrible discrimination]
+**Alice**: Can you think of any _other_ possible interpretations of the data?
+**Bob**: No.
+**Alice**: Like, what do you make of the observation that the trans women's violent crime rate was not just higher than cis women's, but also strikingly close to that of cis _men_? Can you think of any reason—any reason at all—why that _might not be a coincidence_?
+**Bob**: No, that has to be a coincidence. What could trans women and cis men possibly have in common?
+**Alice**: ...