Using a condom, and having the girl on birth control during sex. Also it involves the guy pulling out. 3 different ways to avoid pregnancry, hints the 3 point play.
Buddy 1:Damn, last nite dude i had the best sex. And i know i didn't get her pregnant b/c we used the 3 point play!
Buddy 2:What's that man?
Buddy 1:Oh, she's on birthcontrol, and i used a condom and pulled out before i came.
Buddy 2: OH!