Pubic hair!

While it is (of course) the person's own choice how they groom/style their crotches, I like a full bush. I think there is nothing hotter than seeing a thick bush, and it can add alot to non-nude sexiness. (Tell me seeing a gal in a bikini or jeans with a bit of fuzz sticking out of the top below her belly isn't hot! You do and I will disagree sternly!)