Rapper/actor Nick Cannon fears he's the next star to be extorted by a sex tape controversy because he has no idea where film of past sexual conquests is. The 25-year-old lothario, a former Nickelodeon child star, was recently dumped by Christina Milian for allegedly cheating on her, and he admits he once lived for "smashing off" women and often filmed his sex shows. Cannon tells urban magazine Complex he's surprised one of his missing sex tapes hasn't already hit the Internet, where the likes of Paris Hilton and Colin Farrell have become reluctant porn stars. He says, "I heard there was one out there already. I used to have a house in the Hollywood Hills when I was 19... I know in my room I had the video cameras set up, and I don't know what happened to a lot of those tapes. "We were throwing parties every day. I had to move out of LA because I was too wrapped up in that scene. "It wasn't really about girls' feelings; it would just be like a contest to see how many girls I could smash off."