Mila Kunis may have rejected Justin Timberlake's off-screen advances while filming Friends With Benefits last summer, but the sexy twosome have plenty of on-screen chemistry in the film's raunchy new trailer.

After being dumped by their lovers (played by Emma Stone and Andy Samberg), Kunis and Timberlake make a pact to forge a strictly physical relationship. The only rule? "No emotions, just sex."

And yes, Kunis and Timberlake show plenty of skin in the racy preview -- not that the actress, 27, had the easiest time disrobing in front of Timberlake, 30.

"It's very awkward. I mean, the truth is, we got to have very uncomfortable scenes for two weeks," she told Ellen DeGeneres in December. "There's like 150 crew men watching and you see each other's bits and pieces. The whole thing is just wrong!"