I agree, it seems to be easier to cum when you flex all the muscles in your pelvis, ass and thighs (think about it angela146
. But one I time I was trying to hold onto it and by complete accident right before I was about to cum I relaxed. The orgasm paused right before it crested for about 5 or 10 minutes. I can't even explain how fucking amazing it felt!! As the orgasm tried to get out I would just relax every muscle down there and breathe deeply from my diaphragm and it would hold right at the top. I don't know anything more about doing this (I've never seen anything similiar in an article or anything) but I suggest giving it a shot. It takes some concentration but the payoff is awesome. Plus chicks love watching you lose your mind! If you have any questions, just ask...