You could wee at any toilet in Duke Nukem, and in DN3D there was one cutscene of him ripping off a Battlelord's head and crapping down it's neckhole. What was nice in that game was that you could actually step in lizard alien poop and track it everywhere, but for some reason human turds in DNF are indestructible, you can bounce them everywhere like a rubber ball and they never fall apart.
Maybe that's why there are no toilets now in Hyrule? Every time one attempts to make a toilet it get's infested with ghosts, and who wants a cold pale hand prodding them in the tender regions while they are trying to take a crap?