Twilight star Kristen Stewart talks 'most epic sex scene'

Robert Pattinson and Kristen Stewart in a scene from the film The Twilight Saga: Breaking Dawn Part 1.

Kristen Stewart agonised over her sex scene with former boyfriend Robert Pattinson in the Twilight franchise because she wanted it to be "so good".

The actress explains she felt pressure to live up to what fans wanted to see in the vampire love scene, and it led to a few sleepless nights.

"I only hate (sex scenes) when they're contrived. That's when it's grotesquely uncomfortable," she tells Harper's Bazaar UK.

"On Twilight we had to do the most epic sex scene of all time. It had to be transcendent and otherworldly, inhuman, better sex than you can possibly ever imagine, and we were like, 'How do we live up to that?' It was agony... I wanted it to be so good."

Stewart and Pattinson were dating while filming the movies, but they split in 2014. He is now reportedly engaged to singer FKA twigs.

- PAA