"'I just go in and say, 'Oh f---, let's do it,' and boom. If you complain about it or procrastinate, it's not going to go away. It's a profoundly bizarre thing to do. As actors, you talk about it all the time. You can literally be tangled in sheets, and you turn to the other actor and say, 'What the f--- are we doing?' Dear Mum, at work today I had so-and-so's left nut sack pressed against my cheek. It's sort of unethical if you think about it in those terms."