Singer-actor Justin Timberlake has insisted that engaging in casual sex is never a good idea, because it often leads to emotional complications.
"It's a really good idea until it becomes a bad idea. It probably becomes a bad idea really fast," CTV.ca quoted him as saying during a taping of ''The Ellen DeGeneres Show''.
"If you're going to be intimate with someone at some point somebody's going to feel something.
TV host Ellen joked: "If it's bad, then no one's going to develop any feelings."
Justin retorted: "They'll develop a feeling but it's going to be uh, uh."
The 30-year-old heartthrob - who recently split up with Jessica Biel after four years of dating - is currently starring in ''Friends With Benefits'' with Mila Kunis, which tells the story of two young professionals who decide to have a purely physical relationship which goes wrong when his character falls for Mila's.