I shave mine and sometimes my boyfriends; sometimes he shaves mine. It becomes very erotic and the sex is even more heightened.
In college, I had a friend who made extra cash as a stripper. He always wanted to be perfectly manscaped. One time he asked me to help him out, I, of course knew where this would lead and so I did. He became such a perfectionist pain in the ass about the whole process. Then he asked me to shave his butt crack and get as close as possible to his hole. By this point, I had had it with him and wasn't as careful as I should have. As it turns out, he ended up with an in grown hair right along his butt crack where his t-strap would rub....I still laugh about it to this day.