Reality: We've been conditioned to think that if a guy can't go on almost endlessly, he's somehow unmanly--or his lover will end up unsatisfied. In fact, while reports vary, most surveys have found that the averagesession of sexual intercourse lasts from three to 10 minutes--anything beyond that is gravy. And since, as mentioned above, most women won't achieve orgasm through intercourse, "you're going to want to round out your sexual sessions with other techniques anyway," Stein says.

What to do about it: Expand your lovemaking repertoire so you're able to give her as much pleasure as she wants before, during and after intercourse. Learn foreplay techniques, from kissing her all over to rubbing her in interesting ways. And if you want to extend your own pleasure during intercourse, try breathing deeply and slowing your movements to calm yourself as you approach the point of no return known as "ejaculatory inevitability."