Daniel Radcliffe was confident he wouldn't get aroused while simulating a naked sex on the West End stage - insisting 900 people watching you is a turn-off The 17-year-old Harry Potter star stripped naked onstage with co-star Joanna Davies in controversial London play Equus recently. He says, "It's the least arousing process. Jo's beautiful, but with an audience there, when you get naked in front of 900 people, quite the opposite happens"