For "Twilight" fans who felt there wasn't enough Edward in "New Moon," [article id="1641548"]Robert Pattinson[/article] agrees. The actor said on "Nightline" Monday night, too, was frustrated at the spectral role his undead vampire hero played in the series' second film, and that he's excited to have a more robust presence in the upcoming third installment, [movie id="420622"]"Eclipse."[/movie]

"That was the most frustrating thing about the last one, I was just kind of straight on green screen, and I did it all in about two days at the end," he said.

In an era when the vampires of HBO's "True Blood" get graphically involved with their human lovers, the chaste nature of the characters in Stephenie Meyer's "Twilight" books has hooked a teen audience. But Pattinson -- whose character insists that Edward and Bella must marry before consummating their love -- thinks fans still enjoy the stories' sexual tension.

"If there was a hard and fast decision by both of them saying, 'We're going to remain virgins our entire life,' it's never going to happen," he said. "I don't think it would be a popular series. Anyone who likes the books, they all think they're really sexy. They just like that moment, the kind of tipping point before it goes over. Everybody likes that. That's the best part of a relationship."

And because auditions can be nerve-wracking, Pattinson admitted that he stole some Valium from a friend to calm his nerves before he auditioned for the first "Twilight" movie. "I knew it was going to be a long audition because I was doing a screen test and it was at the director's house," he said of his tryout for the first film with Catherine Hardwicke. "Twenty minutes before I had to leave, I suddenly started panicking. Luckily, the person I was staying with had enough Valium on their bedside table. I stole it. Probably one of the best decisions I've ever made."

Pattinson, 24, also admitted that the rush of instant success he's had since "Twilight" became a worldwide phenomenon has made him question his mortality and good fortune.

"I guess I just thought if too many good things happen, then you're going to die at 30," he said. "I was like, 'I didn't want that to happen.' "

And when interviewer Chris Connelly noted that good things keep happening to him, Pattinson responded, "Yeah, so probably I'm going to die at 30. Actually, it's God saying, 'You shouldn't have asked for too much.' "

Check out everything we've got on "The Twilight Saga: Eclipse."

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