You could have just said “chromosomes.” Good job, you think some men can get pregnant. Of course, you probably think Swyer syndrome is an exception to your rule that XY=male and XX=female, which throws a bit of a wrench in the idea that sex can be defined by something like gamete production or chromosomes. These people exist and have to get driver’s licenses and shit, it’s not like you can just pretend they’re an outlier so they don’t matter. Should their sex be determined by chromosomes, or the gametes they have? Or is there perhaps a third, more useful method of determining whether to call them men or women?

…maybe we could just ask them?

It’s almost like it’s an insanely complicated subject that requires more than a grade school education to understand and more than one sentence to define