that reminds me of this time I was with this girl that was into that kind of stuff. I didn't know at the time because looking at her she was pretty preppy so you wouldn't even think she was into it. She asked me if she could take out a razor blade and I asked why. She said "I like cutting around a guy's nipple and then suck on the blood while I nibble on the nipple.", I responded with "I like cumming and then rolling over and going to sleep. How bout we do that instead?" She got all insulted and things basically stopped right there.