I don't mind answering! The first culture that came to mind was the Navajo's concept of the third gender that is both female and male, but also neither - Two Spirit. But there are others, like the Hijra in Hindu societies, Muxes in Mexico. There are more and I just find the whole concept...
Hehe I was taking this as a challenge too but wasn't sure if all questions were allowed xD
Let's see....
Why do some cultures have only two gender categories and other cultures recognize multiple?