It is a complete mind game, premature ejaculation is always a thought pattern that brings it into being. Most men will agree that when they do have this issue they are thinking about it when it happens. The trick is to submerge yourself in the pleasure of the sex you are having and keep your mind there. The second you start worrying about it happening it will start to happen. It's kind of like the saying, if you concentrate on the bump in the road you will probably hit it.