[Chris]

its pretty much all about self control. when guys masturbate, most of the time they are trying to reach climax as quickly as possible, where as with sex you're trying to make it last. you can practice self control when you're rubbing one out by completely stopping when you feel the climax coming on, take a few seconds without the stimulation, then get back at it. it helps with control, and when you're with a girl and about to climax, a good way of dealing with that is to pull out and switch positions. she won't even know that you have a problem since switching positions is natural during sex, and it gives you time to settle down without the direct contact for a few moments.