Gender identity is a fairly recent cultural invention too, it just started out as a euphemism for the desire to be the opposite sex, or, more commonly, some stereotyped idea of the opposite sex.
In a culture without such polarized ideals of how males and females should behave and present themselves, the concept probably wouldn't exist at all.
In a culture without such polarized ideals of how males and females should behave and present themselves, the concept probably wouldn't exist at all.