You can't, but since gender isn't defined by anything physical, there's no need.
That is only true if you're using an extremely idiosyncratic definition of gender. As far as 95% of English speakers are concerned, gender is defined by the body you possess.
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That is only true if you're using an extremely idiosyncratic definition of gender. As far as 95% of English speakers are concerned, gender is defined by the body you possess.