Australian movie star Eric Bana has turned his back on butt shots onscreen for the sake of his family. The actor, who bared all in The Time Traveler's Wife and The Hulk and showed off his backside on the cover of a comedy album, insists his family comes first and he doesn't think he can be a great dad if he shows his bum on the big screen. Bana explains, "I retired it... I think it was the summer of 2010, I just woke up one day and I said, 'The butt's done!' "It's not gonna happen... It's for parental purposes... You can't walk onto the school grounds and hold your head up high having just dropped your pants at work."