Scottish actor James McAvoy hated shooting sex scenes with his co-star Keira Knightley for new movie ATONEMENT, because he found them "sweaty and uncomfortable". The 28-year-old admits he dreaded filming the raunchy sequences with English beauty Knightley. He says, "(Sex scenes are) always a nightmare. It's never easy and it's always a little bit sweaty and uncomfortable. "When they call action, if you feel the lady's breast, it's your decision to feel the lady's breast. It's like, this is wrong. You have no parameters." And as Knightley was just as embarrassed about disrobing in front of her co-star, the pair apologised to each other afterwards. MCAvoy adds, "We carried on and about 10 seconds later we just said very sheepishly, 'Sorry about that.'"