I've always wondered why there aren't baths too. Also, toilets - for a game as concerned with nitty-gritty everyday realism as DF, you'd think building a plumbing system to dispose of poo (or at least designating a hole in the ground) would be included.
Toady has already said that the game will not be this nitty-gritty and realistic.
Smashing a child in the torso with his mother's severed leg and having it collapse into a lump of gore, or having a large group of impatient cave-adapted dwarven corpse looters create massive rivers of vomit outside your fortress, that's -- if not tasteful, avant-garde at least.
I think we all know the real reason poo is not going into DF -- the carp bribed Toady to keep it out because otherwise (until throwing damage is toned down) rhesus macaques will take their throne as the most lethal animals in the game.
The spinning *monkey poop* strikes Urist Lokumdastot in the head!
It is smashed into the body, an unrecognizable mess!
Your settlement has crumbled to it's end.
*ten years later, an adventurer has the misfortune of visiting that particular fort, which is now owned by the macaques*
The spinning *monkey poop* strikes You in the body!
Your right lung has been pierced!
Your left lung has been pierced!
Your heart has been pierced!
Your liver has been pierced!
Your spleen has been pierced!
Your pancreas has been pierced!
You have bled to death.
The Rhesus macaque picks up the Iron Shield.
The Rhesus macaque beats Urist Adventurer's corpse over the head with it.