The Columbia University student who carried her mattress around campus to protest how the school dealt her alleged rapist has created a video of herself having violent sex for her latest art piece. Emma Sulkowicz's new work, 'Ceci N'est Pas Un Viol' or 'This is not a rape', shows the 22-year-old engaging in consensual sexual contact with an unidentified man before it takes a dark twist. In the footage, she cries in pain and protest in a dorm room as she is slapped, choked and forced into rough sex, the New York Daily News reported. The video was posted on...