Two sexually active adult couples compete in a risqué game of charades. The winners receive a luxury vacation, while the losers face a forced partner swap. The women desperately act out clues with their panties exposed, but every wrong answer brings another punishment: fingering, vibrator play, facesitting, and 69. As the challenges continue, both couples become increasingly turned on, finally abandoning their inhibitions and swapping partners as the game develops into an orgy.