Genders. There are three of them in Romance and Germanic languages. There are two and only wo sexes in mammalian biology. This professor, learned as she might be does not know the difference between sex and gender unless, that is she uses “gender” instead of sex because she knows that there are only two sexes but there are more than two genders, albeit only one more and she thinks the meaning of “gender” is amorphous and so can be used to mean what she wants it to mean. But isn’t that true of words generally as liberals use them and want to force sane people to use them?
As you well know, they “reappropriated” the term for their own purposes. But yeah, it only exists in their minds.