+Of course, people who believe in the primacy of gender identity over biological sex aren't _trying_ to engage in circular reasoning. If they _are_ making a philosophical mistake, there has to be some explanation of what makes the mistake appealing enough for so many people to make it. But it's not hard to guess: there are, empirically, a small-but-not-vanishingly-small minority of people with a penis, XY chromosomes, facial hair, _&c._ who _wish_ that they had a vagina, XX chromosomes, breasts, _&c._, and in a enlightened techological civilization, it seems humane to accomodate this desire as much as feasible, by giving people access to hormones and surgeries that approximate the phenotype of the other sex, respecting their chosen pronouns, _&c._ Thus we can legitimately end up with a _non_-circular trans-inclusive definition of _women_: "adult human females, and also adult human males who have undergone interventions to resemble adult human females sufficiently closely so that they can be taken as such in social situations." But this is a mere broadening of the "adult human female" definition that tacks on extra complexity for humanitarian reasons; the core idea is still intact.
+
+One could argue that
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