[Jensson]

> Factually incorrect, even if you limit yourself to humans. There are people with XXY and XYY chromosomes.

XXY and XYY aren't genders, gender is a social construct. And society has constructed two genders, male and female. I know that some tries to construct more genders, but it doesn't seem to work, we still just have two socially accepted genders. Male - Female has so extremely strong cultural roots and everyone have very strong associations to those, trying to create something new that doesn't have the same backing and calling that new thing a new gender isn't the same thing, it isn't a gender without all that cultural baggage.