If you are born with a penis, you have XY chromosomes, which makes you male

This is an extremely autistic nitpick, but that's not necessarily true. It's the SRY gene that controls male-ness, not the Y chromosome. It's usually on the Y chromosome, but it can end up elsewhere in extremely rare genetic mixups, leading to a man with no Y chromosome.

What makes that especially interesting is that "SRY, you're male" has two different meanings depending on who you're addressing.