Earlier quoted context omitted.
Gender =/= Sex How it is so many people don't grasp this is beyond me.
As fluid as people wish it was, certain gender identities highly correlate with certain sexes. To be male sexually and female behaviorally is abnormal, statistically speaking. This gender =/= sex is a recent concept invented by mankind.
I thought it was fairly recent concept too until I learned this tidbit in a Anthropology survey course:
https://en.wikipedia.org/wiki/Third_gender#Indigenous_cultur...