btw Apparently, STORKS deliver children on Mushroom World (or probably Mario Universe), so there is no reason to believe Mario characters have 5ex.
Getting serious, of course mushroomers have pinuses and ******s, just as everybody else. I like to think Koopas are also 'normal' that way, but actually they're egg-born, so... it's not the same. They arn't actual reptiles, though: Bowser was red-haired on SMAS'SMB1.
--
"- When people think you're about to die they really listen to you, not--
- Not just wait for their turn to talk."
-Jack & Marla, Fightclub