From the back of the box:

Sip 'n Go Naked is the wildest and most unpredictable party game ever invented! Fill your drink and bundle up. The winner in this game is the last person to remove all of their clothes! Roll the dice and make your way around the board. Do you Sip? Do you give out Sips? "Go Naked" cards help you avoid doing exactly that, but once you run out, the clothes come off! The longer you play, the more exciting this game gets!