Put Valentine in a long, white silk nightdress. Tell her she's going to play the part of a Victorian heroine or something. Set up a classic chase-the-maiden scenario by posting well-hung studs at different hidden locations around the mansion.

Valentine must visit certain parts of the mansion. Each one brings her into the proximity of one of the fraternity hunks. He will be allowed to chase her for a certain period of time, say, 60 seconds. After that he's removed from eligibility.

A guy who captures Valentine then has a certain amount of time (say, 5 minutes) to bring her down to the dungeon where there is a rape room. And he cannot rip her gown off until two of her limbs (any combo) are tied down.

The clincher: Valentine does not know that this is a rape game. Or maybe she's told that she will play the part but it will be aborted at a certain point--but it isn't!