There was a time when I said "I like a little pain in sex." I used to think I only liked a little, and was afraid to go much past some hair pulling or a slap on the ass. I didn't even realize it was happening to be totally honest... but my Master managed to push those boundaries slowly to ease me out of that fear. It's not so much the pain I love, but the chemical reactions from the situation and the pain mixed. My only advice ever is, don't be hard set on your limits. I was, and now feel kinda silly because of all the wonderful things I would have missed out on if I hadn't been willing to push a little.