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.
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.