[E. Pluribus Unum]

There are two sexes: male and female.

There are three genders (a grammatical term): masculine, feminine and neutral (not referring to either sex but only to people in general).

Everything else is mental illness.

[Paal Gulli]

"There are three genders (a grammatical term): masculine, feminine and neutral (not referring to either sex but only to people in general). "

There's also "common gender" but your overarching point stands. Sex is a biological distinction. Gender is a grammatical distinction.

[who knows what evil?]

XX and XY...it’s science!