I voted sex, but really it's when he does me from behind while I use a vibrator on myself. It really is the sex that makes it, though, because when I just use a vibrator on myself it isn't nearly as good. The combination of feelings really gets me going, especially when he's really worked up and maybe a little angry and just pounds me as hard as he can. He gets so big when he's like that and so determined and I lay there and feel every inch of him jamming in me faster and faster. It's rough and a touch violent, but I'm totally crazy about it and I come for so long.