“It seems you can’t completely get rid of your genitals… what are you gonna do, piss out of your ass?”
Yes, it’s called a cloaca and is arguably the most efficient anatomy for discarding waste.
Sh*t it took me a while to understand what a Cloaca is.
The urinary system is the Cloaca, at least from my deep dive, it's perfect for humans as the urinary system, or the used to be cloaca is meant to be able to hold in pee until you deem in necessary to relieve yourself.
So technically? We do have it, it's just separated into a whole system.