Your PC muscle is the muscle that you can use to stop the flow of urination. By exercising your pc muscle on a regular basis you can get harder erections, and more powerful ejaculations. It can also help you last longer in bed.
One of the ways you can use the PC muscle to last longer during sex is by squeezing it when your near orgasm and slowing down your penetration. Go very slowly squeeze your pc muscle, and calm your excitement!
I know it can be quite a challenge when your in a woman to calm your excitement, but slow your roll and reap the benefits of seeing your woman get off!