After teasing us with a demo of "Sex Rules" last summer, L.A. pop singer Sky Ferreira released the final version of the song on iTunes today. It's a totally fun and frolicky 80's throwback tune that is a perfect tastemaker for her forthcoming EP "As If." And don't be surprised if you hear "Sex Rules" on a television screen near you. The song is featured in a new Calvin Klein ad campaign that gives Sky some welcome new exposure.

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