@Mrfunkedude A foot.
1: only socks would need changing every day instead of socks and underwear
2: its the furthest part from your nose
3: squeaky shoes wouldn't matter any more
4: you wouldn't have to get half undressed to go to the loo
4 is very important. Can you tell that I'm pissed that women haven't evolutioned better so we didn't have to half undress every time we need a pee ?