Jack Nicholson was once so committed to nudity he refused to wear clothes when welcoming guests into his home, according to a revealing new biography. In his new book Five Easy Decades, author Dennis MCDougal claims the movie icon even sat naked for interviews to promote his 1971 film Drive, He Said. The writer says, "He lived for three months as a nudist at his house - refusing to wear clothes even for producer Roger Corman."