One might think having to get it on with Mila Kunis or Justin Timberlake for a big-screen comedy would be easy. But the "Friends With Benefits" stars insist that there aren't too many benefits to having to get busy with so many eyes on you -- unless you're in on the joke, that is.

"These were, in fact, less awkward, because we were required to make them awkward as the characters," Timberlake told MTV News, with onscreen bestie Kunis by his side. "We were going for laughs, and that breaks the ice a little bit, so you don't feel like you're having to portray something a certain way."

"Friends With Benefits" opens Friday and revolves around Kunis' and Timberlake's characters trying to mix friendship and sex without letting their emotions get in the way. It also features an all-star cast with names like Patricia Clarkson, Woody Harrelson, Andy Samberg, Bryan Greenberg and Emma Stone adding their opinions and insights to the potentially fatal friendship idea.

As explained by the twosome, the goofier Timberlake acted about the whole thing, the easier it was for the real-life friends to pretend to get busy with each other. "I basically just jumped around a lot and made Mila laugh as much as I could," he said.

Timberlake even used his skills as a musician to make a potentially uncomfortable scenario less so. "We made up some songs together, mostly about [director] Will [Gluck]," he said.

So how did Gluck feel about those ditties? Well, he didn't really get the chance to hear them because, as Kunis shared, they performed them "behind his back" and she had no plans to perform them again since they are a bit NSFW.

"They can be re-performed, but not on MTV," Timberlake chimed in.

Check out everything we've got on "Friends With Benefits."

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