From the book:
The monster will kill you. The lover is willing.
From the back of the book:
Phantasmagoric face to face roleplaying.
S/Lay w/Me is a game played by two people at a time. More may participate but only two will be active at once. Enjoying the game requires enthusiastic creativity concerning lovers and monsters.
The selection of narrativist games, for two: Poltergeists, S/Lay w/Me and Breaking the Ice
La belle et la bête chez Conan