[tovej]

Ok, so you don't know what you're talking about. That's fine.

"There's no reason to think they don't all ultimately have a genetic basis". Oh, so you have groundbreaking research results you want to share? Something that would explain luteoma as having a "genetic basis"?

And yes, external sex characteristics is how sex is determined by doctors at birth. And throughout life. If you live as female/male/ambiguous intersex, but have some other set of chromosomes, that does not change your sex.