The 'Sexy Back' singer admits he doesn't feel comfortable stripping off in front of the camera and thinks shooting love scenes is the worst part of acting.
Justin – who had to have sex on screen with Christina Ricci in new movie 'Black Snake Moan' - said: "When you're doing them you're constantly thinking it isn't going to look hot at all. I'll crack a joke or something so it is not as uncomfortable." Despite his reservations, the singer-and-actor admits his racy scenes with Christina were "hot".
Justin, 26, said: "The sex scene was pretty hot. I'm not going to say it doesn't feel weird pretending to f**k someone in front of a man with a sound boom, though." The heartthrob admits he was nervous about having his naked butt shown on screen, but after sharing his concerns with the director some of the more revealing sequences were cut.
He said: "One of the first conversations I had with the director was about nudity. In the first cut you could see my a** but, thankfully, that was taken out.
'Black Snake Moan' was released in March.