Playing a strip game

So, you decided to play a game with three friends while you're in your house one weekend. You and your friends plays all the board games that you have in your house, but, son enough, you all get bored. So, Beth, one of your friends suggest playing a strip game.
You aren't sure, but since your other friends accept to play, you end up accepting. All agree to make some sexy forfeits, but nothing so nasty.
Now, the only thing to solve is what game play? Strip blackjack? strip poker? strip dice? strip rock-paper-scissors? Other?