Ideas for sex games?

Anybody got any ideas for sex games, especially involving teasing or denial? When I was a teen, my friend and I laid on the floor naked and my girlfriend got between us and jerked us off. The game was that the one who lasted longest got to screw her. The other only got to watch. I came first and lost that one. Later in life, although we never did it, a girlfriend thought it would be exciting to have several guys screw her with condoms on, and the one whose load was the smallest would have to empty them into his and take them all down. Would like to hear about other similar games, ideas.

I have one! Go out to a public place and have her pick out a man that she likes. Walk up to the man and tell him that she is your sister-in-law. Say that you two were takeing and she made a bet with you that she would not go and give a stranger a handjob. Tell him that he was her pick. There are very few men that will turn down a free handjob. tell him that you want to make sure she's doing the deed, and watch what happens next.