'True Blood' stars Anna Paquin and Stephen Moyer can get carried away during their sex scenes in the vampire drama.

Stephen, 40, admits his real-life relationship with 27-year-old Anna means there are no boundaries on set.

Speaking about their chemistry on set, he joked: "I think that one great bonus is we don't need a fluffer."

A fluffer is a person who helps male performers maintain their erections in porn movies.

Bisexual Anna also admits she and the rest of the show's cast are comfortable being naked around each other on set.

She told Entertainment Weekly: "It doesn't really bother me. I'm really close with all of our cast, and we've all seen each other in various compromising and odd situations."

Anna and Stephen have been together since 2007, and play lovers Sookie Stackhouse and Bill Compton on the show, which is based on the 'The Southern Vampire Mysteries' novels by Charlaine Harris.

Also joining the popular programme is Joe Manganiello, who plays werewolf Alcide in the new series, and he has wasted no time in getting his clothes off for the role.

He said: "Having been a fan of the show, you know you're going to be naked at some point.

"I will say that I was welcomed into the brotherhood of the sock. When you're naked on the show, you have to wear a sock, and it's NOT on your foot."