Remember when trans people literally didn’t exist 15 years ago? Good times.
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In all seriousness, you're right that the category of homosexual is only a recent invention, and one which is circumstantially confered through institutions, even though men+men and women+women have been making love forever. Gender, I believe, functions in a similar way
Also interested in whether or not the physical "transition" part of being trans would be considered necessary if this were not the case, or if transgenderism would exist in any real sense