What gender should XXY use?
(also, don't confuse gender and sex)

If Ya Go Past The Only 2 Genders on This Whole Daumn Mudd Ball We Live on , just use the litter box and to give you the answers you seek

What about someone who was born with female parts on the outside and didn't find out until they are a teen that they have male parts on the inside and are genetically XY but have 0 testosterone and therefore look female? What "gender" should they be? (It's a real medical condition called pseudohermaphriditism)