Given the amount of time I've dedicated to this topic, this is something that I've actually never thought about. It reminded me of something mike said a while back here, I think in regards to intelligent design. I'm paraphrasing, but he suggested that having our sexual organs be used both for procreation and peeing and so close to our asses didn't make good design sense. He suggested that we should defecate out of a hole in our foot, or something like that... (sorry for the poor recollection Mike). Anyways, the reason it brought that to mind is because, given all of the importance we place on these things, sex and defecating/urinating we rarely think about how our bodies are designed for these things. At least I don't think about it often. Peculiar stuff.