I know someone who was a werewolf/lycanthrope ranger who had a wolf animal companion... She took being a furry to a whole new level.
Also, there is a book out that I read, it's called Middlesex. It's about how after 2 generations of incest, this kid is born as a girl, and at puberty, develops male genitalia as well... And it's basically due to the inbreeding.
Anyways, if I were a DM, I'd totally include something screwy like this in the game. It throws the players for a loop! Then again, I wouldn't make it like a main focus of the game. It'd be strictly a chance based occurrence; there'd be a one in 20 chance that they'd somehow stumble upon a hermaphrodite, and a one in 10 chance that they'd actually figure out how the hermaphrodite came to be...
You get where I'm going with this.