In a movie or videogame, a gratuitous sex scene is one there simply for the sake of being there, in a vain attempt to make the rest of the movie or game look cooler.
The "gratuitous sex scene" in wayne's world never actually contained any sex. It just said gratuitous sex scene at the bottom and Mike Myers giving a thumbs up (her vagina)
by Kung-Fu Jesus April 17, 2004