1 - Find a girl.
2 - Number one is the hardest part, so let me stress again - find a girl. Get her to your house. Make sure she's a bit thick.
3 - If she's not, play her with booze until she is.
4 - When you're kissing just start to pull her pants off. You'll known by this stage if a rapo or sex is on the cards. Don't take her top off. This way it looks more like rapo to anyone walking in.
5 - Just take her keks off and start to shag her as hard as you can. No time for a condom.
6 - Don't ask for it, for fuck's sake. If she says yes then you haven't committed a rapo.
7 - Make an amusing conversation involving her and your mates the next day. Nobody likes a good rapo story better than your mates. If the girl's sound she'll see the funny side of being rapod. All girls are little slags anyway.