you could try going to somewhere like a fancy restaurant then playing a game of 'dare'. Sounds like something teenagers do i know, but you take turns throughout the meal daring each other, starting off small, such as flashing underwear, then proceeding to retreating to the toilets or outsaide for more intimate dares and get more and more extreme until one person refuses to continue. Then the loser has to be the other's sex slave for the whole next day or something.