Robert Pattinson says he wasn't prepared to film his first sex scenes for the upcoming period drama "Little Ashes."

The "Twilight" actor portrays Spanish artist Salvador Dali as a young man. He tells GQ magazine's April issue that he was uncomfortable as crew members watched and giggled during his graphic interlude with a male co-star.

"In a lot of ways, I was kind of crossing lines of what I thought I was comfortable doing," he said. "I had to do all this naked stuff."

The British heartthrob says he wanted to try "something weird," but the part was more difficult than he'd anticipated.

Pattinson has found a way to take the edge off before: Pattinson says he took a quarter of a Valium pill before his "Twilight" audition.

(China Daily/Agencies, March 16, 2009)