Robert Pattinson was "scared" when he had to film a sex scene with girlfriend Kristen Stewart

The 25-year-old star and the brunette beauty performed a raunchy scene in which they break the bed in The Twilight Saga: Breaking Dawn - Part 1, and the actor admits he felt more distracted looking for his cue rather than romantic.

"I've never done a sex scene where it's kind of scary because you think something is going to fall on you! There was a whole stunt set up with three guys, who do all the explosions and things, all lying under the bed. I spent the whole time looking at them for a signal. It was funny, though!"

The British actor has taken Kristen to the UK on a number of occasions, but the US-born actress is "always amazed" at how many people go to the pub during their lunchtime. "I probably spend more time in the UK than Los Angeles, but I've been so busy traveling with work that I don't really know where I'm going to be based full-time yet. She's always amazed by the fact that it is totally acceptable to go to a pub at lunchtime over here. I don't even do that."