"Sex Rules" is a song recorded by American recording artist Sky Ferreira for her debut extended play As If! (2011). It was released on March 1, 2011 by Capitol Records as the lead single from the record. The song was written by Ferreira, Greg Kurstin, Billy Steinberg, and Daniel Lutrell, while production was handled by Kurstin. Looking to transition from the disco music elements seen in her earlier single "17", Ferreira explored electropop and synthpop styles with "Sex Rules". In the track, Ferreira frankly declares her infatuation for sexual intercourse.

Contemporary music critics commended "Sex Rules" in their reviews, and expressed a particular appreciation for its experimental production. However, the track failed to impact any national record charts. Furthermore, an accompanying music video for the song was never released.

After releasing the tracks "17", "One", and "Obsession", Ferreira announced that her debut studio album would be released on January 11, 2011. However, it was instead replaced by her first extended play (EP) As If!, which was made available on March 22. In anticipation of its release, Capitol Records commissioned "Sex Rules" as the lead single from the project; it was released through the iTunes Store on March 1, 2011. The track, and Ferreira herself, were featured in a commercial for the American fashion house Calvin Klein; she believed that the publicity she received from her projects in the fashion industry was beneficial to her aspirations in the music industry, and specifically credited her first collaboration with Calvin Klein with "[making] a lot of different audiences, both in fashion and music, aware of my work."

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