Twilight sex scenes too racy for censor

Fans are gearing up for the racy conclusion to the Twilight saga. Photo / Supplied

Sex scenes between Robert Pattinson and Kristen Stewart in the upcoming Twilight sequel have been scaled back after the film was given an R rating by American censors.

The couple, who are alleged to have been seeing each other throughout filming of the Twilight series, are set to steam up the big screen in The Twilight Saga: Breaking Dawn - the first of a two-part conclusion to the vampire film series.

Stewart says the scene was so racy US censors gave the film an R-rating.

She told Glamour magazine: "It was so weird, it didn't even feel like we were doing a Twilight film. I was like, 'Bella! What are you doing? Wow! What is happening here?

"It was very surreal. We got rated R. They re-cut it."

Pattinson also revealed both her and Kristen felt "vulnerable" when they were shooting the film's sex scenes because they were so many different people on set, most of whom seemed as nervous as the performers.

"The sex scenes were difficult. The set was crazy and you have about 20 people in the room and someone saying things like, 'No, Bella would not have made that noise. Can we do it again?'

"It was very charged, but a very tender and sentimental scene. It's not a scene from the book, so everyone was nervous about doing it right. A ton of other people were nervous.

"And, Kristen and I were both worried about the shape of our bodies would look on camera. We felt vulnerable."

Hype around the film was unbelievable, he said.

"It's strange trying to do a singular event which everyone is expecting. At the end of the day, watching other people have sex is never going to be that spectacular. Hopefully it'll be good. There's so much hype. You're like, 'God, I hope this lives up to it!'"

However, it is not the only scene Robert is nervous about - Kristen's character Bella eventually gives birth to a half-human, half-vampire baby with gory results and the actor says the on-screen labour were "horrible".

He told Total Film magazine: "It was horrible. Insanely graphic and the most nerve-wracking thing about the whole shoot!"

The Twilight Saga: Breaking Dawn - Part 1 will be released in New Zealand on November 17.

- AAP with BANG! Showbiz