Singer Justin Timberlake and actress Mila Kunis are featured in a mock public service announcement requesting the public to support a "friends with benefits" status option on Facebook instead of the traditional "in a relationship" notation. This is all part of a cleverly crafted public relations campaign to promote their new movie "Friends With Benefits", which premieres on July 22. The couple already set tongues wagging after they pawed each other passionately while presenting at the MTV Movie Awards show on June 5th.

All kidding aside, Justin and Mila have a point. According to the landmark study by  University of Texas Sociology Professor  Norval Glenn and Elizabeth Marquardt, Associate Scholar for the Institute for American Values, 40% of women practice "friends with benefits" or  "hooking up", meaning casual sex without commitment. Their research also showed that the other common relationship is "joined at the hip", where a couple that doesn't know each other very well commits to a sexual relationship and spends all their time together.