From gamecareerguide.com (via gamasutra.com):

Spun from a game concept put forth at the Nordic Game Jam, Dark Room Sex Game is a Wiimote enabled game in which players try to climax with their partners – with no on-screen visuals whatsoever. The students from IT University Copenhagen who made the game submitted it to this year’s Independent Games Festival Student Competition. GameCareerGuide caught up with them about the titillating title.

…

Description: Dark Room Sex Game is an erotic multi-player rhythm game without any graphics, played only by audio and haptic cues. The game can be played with Nintendo Wiimote controllers or a keyboard.

In Dark Room Sex Game, the player works with his or her partner to find a mutual rhythm, then speeds up gradually until climax. In four-player "orgy" mode, players swap partners randomly and compete to reach orgasm the fastest.

Source