Foreplay is an erotic storytelling game for two or more players (including the GM). Whereas most games of this genre are about fighting monsters, winning treasures, and maybe seducing the local tavern patrons, Foreplay is about seducing your friends (or lovers), f***ing their brains out, and maybe trying not to die of exhaustion. Players work together to tell a sexy story while also doing sexy things. Foreplay is the first game of its kind to incorporate real-life sexual activity into its gameplay system. If you have not played this kind of game before (a good excuse to spend extra time rereading the erotic example texts), it is an easy way to learn to role-play, and if you have, you certainly are in for a substantially different experience with this one. Also, if you already have experience role-playing in a sexual setting without the inclusion of a game, this should certainly spice up your options and make it easier to get your fellow players into character.
More specifically, the core mechanic of Foreplay is that all success checks in the game are dependent on a player's ability to sexually stimulate one or more other players, emphasizing communication and consent as a prerequisite to success. The stat system is built around this and the erotic focus of the theme. In designing the game, I asked myself, "Can I design a game with the intention of having the gameplay devolve into an orgy?" Depending on your group, I think the answer is "yes." While the mechanics are designed to play through an entire story, they are also intended to escalate the sexual tension amongst players, likely resulting in players needing to take a "break" after or during the climax before continuing. It's not necessarily required, but it isn't discouraged. The game also scales down for a shyer audience, providing a smaller window of escalation for those who aren't interested in going "all the way." Players of all level of experience or inhibition are given room to enjoy themselves as they see fit.
There's also a strip-gaming mechanic, for some classic adult party game antics and a whole bunch of scenarios and alternate play modes to fit the game to your group, whether that means dialing it back to touchless or turning it up for an elaborate BDSM party, plus tips for preparing your group and agreeing on communal boundaries.