Sex dice is a dice game intended to heighten the sexual atmosphere and promote foreplay. Instead of numbers, each face on the die contains the name of a body part; the body part that faces up when the die is rolled must then be given sexual attention.The Daily Princetonian suggests rolling sex dice to "break the ice and extend [one's] foreplay." The University Daily Kansan advises a roll of the sex dice for those who are not particularly limber (and therefore cannot try "new and inventive position[s]") as a means to "bring variety to [one's] bedroom romps."
A commercially available version, also called Foreplay Dice, consists of two dice, one with body parts and the other with activities; a roll of the dice will determine which action is to be applied to which body part. According to SPIN magazine, the game is especially popular among American teenagers.
A pair of sex dice were featured in The Simpsons episode "The Devil Wears Nada", in which Homer rolls them and gets the actions, "lick eyes", "spank hair", and "whisper into ass". At the end of the episode, he rolls them again, and gets "love wife".
In xkcd comic number 708, a pair of sex dice gets mixed up with regular dice, with humorous reactions from people wanting to use the sex dice for their intended purpose and people trying to play a role-playing game, with both groups using one sex die and one regular die.