Dare to Bare: Sexy Celebrity Men Who've Stripped for Movies

Get your fill of Justin Timberlake's bare behind while you can! He told Vanity Fair that stripping was a one-time deal: "It was fun, but I can't say I'm going to be butt-naked in a movie again," he said. "I only did it because I'm young now, and everything's where it's supposed to be. I figured this is the time, before gravity gets the best of me."

Nakedness rating: R