rainbow party

plural rainbow parties

1. A supposed group sex event in which numerous women, each wearing a different color of lipstick, perform oral sex on one man.

   There were no efforts to devise shag-band or rainbow-party laws and no concrete evidence that these sexual games were actually commonly occurring; they remained in the realm of the legend.

   2014, Joel Best, Kathleen A. Bogle, Kids Gone Wild: From Rainbow Parties to Sexting, Understanding the Hype Over Teen Sex, NYU Press, →ISBN, page 17

   1 more example

   She'd heard some kids were going to have a "rainbow party," but had no idea what that meant. Still, she thought it might be fun, and arranged to attend with a friend. After she arrived, several girls (all in the eighth grade) were given different shades of lipstick and told to perform oral sex on different boys to give them "rainbows."

   2002, Margaret J. Meeker, Epidemic: How Teen Sex is Killing Our Kids, pages 22–23