This is another very common problem that most men believe there is no solution for. Premature ejaculation is typically caused by a man's excessive excitement during sexual activities as is thus basically the opposite of either of the forms of impotence.

The best way to deal with premature ejaculation is to train your body to not seek release so quickly. Start off by engaging in any activity that normally ends in an orgasm for you, whether it's masturbation, sexual intercourse, or whatever. Try to focus on the sensations as you proceed and pay very close attention to what increases them. Proceed up until the point where you are just about to reach an orgasm and then STOP. Back off and wait until not only your body has backed away from the verge of having an orgasm but also until you are barely starting to lose your erection and then continue. Bring yourself to the edge at least 3 times before finally allowing yourself to ejaculate. What you're doing here is increasing your endurance and fooling your body into thinking that it should last longer. It's very important to practice this everyday if you wish to properly combat premature ejaculation.

Another method is to simply go ahead and have an orgasm. If you want to do it with your lover feel free and if not you can always excuse yourself to a restroom to do so in private, or maybe right before the beginning of a date. By going ahead and ejaculating once you will naturally take longer to do so the second time around so long as the 2 times are within a few hours of each other. Just make sure that you don't try to do them back to back as many men are incapable of achieving a full erection directly after an orgasm.