We were all in awe of Penny [Woolcock]. You feel so safe with her, you end up doing things that might seem offensive to other people. It's almost like being in a therapy session. You go a little bit further than you would normally. But in the orgy scene, where Marc's really getting a blowjob, I was like, `You've crossed the line!' Me and Alec were acting, and being loving and safe and showing the feeling of wanting to climb under someone's skin. For it to suddenly become something purely physical - I didn't think that needed to be real. But it was a situation that got out of hand. They filmed it at a swingers' club. There wasn't any way of stopping things, once they'd started. It's really gruesome and awful. But for the story, it's perfect. That scene was out of control. But by that point, so are the characters.