-Apples-
“Assorted” Collector
There are 6 biological karyotype sexes that do not result in fetal death. And then there's inter-sexed individuals. It's more complicated than people think. XY male and XX female may be the common majority, however, these are not the only two sexes possible.
I was actually about to add that there are 6 karyotype combinations on the 23rd chromosome pair. Usually, the ones with a Y-chromosome turn out to be a male as the ones without a Y-chromosome turn out to be a female. I know which ones they are, which are x, xx, xxx, xy, xxy, and xyy.