> "Gender" seems to be used as an animal's social-sexual identity That has changed. You can now find many studies in biology talking about the gender of animal

> "Gender" seems to be used as an animal's social-sexual identity That has changed. You can now find many studies in biology talking about the gender of animals (frogs, insects, anything) when they literally mean what you refer to as sex here. > Humans are unique in divorcing sex (and gender) from reproduction. That is highly speculative. We do not understand animals well enough to even know if that is a meaningful question.