1. Robert Pattinson
Little Ashes (2008)
Before he became famous from Harry Potter and the Twilight Series, he had an infamous love scene in the film Little Ashes. The film is st back in 1922 about the young life of the famous artist, Salvador Dali and his bizarre blend of shyness and exhibitionism attracting Federico Garcia Lorca and Luis Bunuel. Rob admitted he was not faking it, and he did masturbate on camera.
He claimed that faking an orgasm on camera “just doesn’t work, so I pleasured myself in front of the camera. My orgasm face is recorded for eternity.”