Someone mentioned in another thread the idea of having public contests where M/F couples would compete against each other to demonstrate their sex skills.
For example, two couples would compete, by having each girl give a handjob to the other girl's boyfriend. However, each guy's cock would be aimed at his own girlfriend's face. The contest would be which girl could make the other girl's boyfriend cum involuntarily on the other girl's face. The winning guy would stroke himself off on the losing girl's face to double her disgrace, while the losing guy would eat the pussy of the winning girl.