Smile Drinking Game
Highly adult game. Low buzz factor, nonetheless quite enjoyable to play.
Approx 6-8 guys or girls (all one sex or mixed, for that matter) sit around a table with a table cloth that hangs to the floor. The participants drop their pants/skirts/shorts to their ankles and a willing person goes under the table to do whatever s/he wishes.
The first "player" to smile has to drink.
Originally a bachelor party game with hired prostitute.