Having sex with a chick.

Sex is the one area where guys have the supreme, winner-takes-all advantage because Mom Nature wants to motivate men to have as much sex as possible with as many female partners as possible. As a result, orgasming is—short of some physical or psychological problem—a veritable inevitability (much like falling asleep afterward and drooling). Sex is, after all, the main reason you're here (you certainly aren't doing anything important with your life, right?). And human procreation lets you “pass the genetic baton” in the hope that your offspring won't be as big a loser as you are.

Sex: A Man's Guide Expert advice on more than 130 topics.

Nine months before you were born, your Mom probably skipped a birth control pill (or your Dad was too drunk to tell he wasn't actually fucking her ass like he thought). Fast forward to today; the same irresistible impulse that suckered your folks into creating you is pushing you do the same stupid shit yourself. The urge to procreate, you have to admit, is some powerful shit; there's no use fighting it (ask any Deadbeat Dad). There are around 15,000 births every hour on this planet. So obviously, "doing it" isn't a problem. The real problem for most guys, is doing it well.

Find girls to fuck who live near you.

As a guy, you are virtually guaranteed to enjoy the sexual experience, even if she doesn't. And let's be honest, if you don't know what you are doing, she won't. Of course, if your partner doesn't have any fun, there's not a lot of incentive for her to let you fuck her again (except, maybe, for low self-esteem, but you can't always bank on that.)

If you want sex more than once with a particular girl, you have to do what it takes to be invited back. And that means learning how to screw.