April 28th, 2011
09:58 AM ET
While hooking up with his best female pal may seem like fun in his upcoming movie, Justin Timberlake believes real-life casual relationships can sometimes get too serious.
"It's a really good idea until it becomes a bad idea," the "Friends With Benefits" star tells Ellen DeGeneres on Thursday's edition of her talk show. "It probably becomes a bad idea really fast."
Timberlake, who co-stars with Mila Kunis in the steamy new comedy, adds that emotions inevitably get in the way.
"If you're going to be intimate with someone, at some point somebody's going to feel something," he says.
And if the sex is bad?
"They'll develop a feeling," says Timberlake, "but it's going to be uh-uh."
Is that what happens in his on-screen relationship with Kunis? Find out when "Friends With Benefits" opens in July.
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