personal perception is variable.
Human BIOLOGICAL gender is fixed in your genetic code.

Now you can argue that an xyy could be categorised as a different gender - but as xyy folk tend to be ultra male - they'd no doubt argue that you were talking out of your arse and looking for a punch up the bracket.

Not sure if you get xxx at all - but generally most people are either xy male or xx female.

Everything else is sociological, and down to personal perception.

Sexual preference is NOT gender.