[ Click here if you are a conservative and only wish to see male/female ]
In all seriousness though, this is what I did for my contact app (it’s a combobox, so you can type whatever you want in there or pick from the dropdown):
That is the whole insurance business. It is nothing but a bet if you look at it by a single policy. E.g. your insurance bets you'll probably die at 70, so when you hit 71 you paid more than you get when you die. Your insurance wins. But when you die at 55 you "win" the bet.
But because there isn't just one but thousands of policies those bets aren't bets anymore, they're nothing but statistics. And one part is keeping track and calculating how old people born in year xy, in country ... with the gender zxy are going to be.
Nope. I don't know exactly why but it seems that e.g. a trans man is more likely to die in a stupid accident like driving a motorcycle without a helmet at 200km/h and vice versa.
It isn't much of a medicine aspect and more of a lifestyle one.
Best to put them in an autocomplete dropdown. My gender is xerxes 1.18373772918474920102738172636634, not to be confused with xerxes 1.18373772918474920402738172636634