In spite of the rather raunchy, nearly naked ad campaign for “Friends With Benefits,” the movie’s all-star cast, including Justin Timberlake and Mila Kunis, turned up fully clothed at the romantic comedy’s world premiere Monday night at New York City’s Ziegfeld Theatre.

But on a hot, sweltering night devoted to celebrating no-strings-attached relationships, the topic of sex came up early and often. So, of course, we had to ask the film’s stars if they thought a friends-with-benefits relationship like the one depicted in writer/director Will Gluck’s July 22 release could really work long-term.

“Not in my life because I’ve tried it and failed miserably,” laughed Bryan Greenberg, who plays one of Kunis’ suitors.

For the most part, Greenberg’s co-stars were of the same opinion.

Jenna Elfman, who plays Timberlake’s sister, said, “I’ve been with my husband for 20 years, so I haven’t first-hand attempted a friends-with-benefits lifestyle.” But she still had her reservations: “I really, frankly, don’t think it’s workable.”

“For some people, yes; for me, not so much,” Patricia Clarkson agreed.

Even Gluck, the film’s writer/director, admitted he thinks it’s an impossible undertaking. “I think the scenario works very briefly and in college — everyone else is kidding themselves.”

The sole dissenter was Kunis, who said it all depends on your definition of “works.” “Sure! I mean, you get upgraded or downgraded; it switches and takes different positions. You get promoted, or you get fired.”

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