Robert Pattinson wanted to have "more thrusting" in 'The Twilight Saga: Breaking Dawn Part 1'.

The hunky actor portrays a sex scene with real-life girlfriend Kristen Stewart in the vampire movie, and he admits it was troublesome to film because to get a PG-13 rating there needed to be limited sexual movement.

He said: "It wasn't me, it was Kristen. I'm still doing the same thing, the general movement. Normally you have problems with ratings like nudity, but this was literally about The Movement. Thrusting! They kept telling me not to move.

"They wanted to have a leash so you couldn't thrust past a certain point. Just the tip or something! That doesn't mean anything, it's just a figure of speech. I mean, they want to see thrusting, not probing."

Later on in the film, Kristen has to give birth to a baby, and Robert reveals there were issues as the newborn had to have a wig placed on its head.

He explained to TV talk show host Jimmy Kimmel: "The adult actors are constantly complaining about their wigs. The baby is supposed to have hair, so they tried to stick on this baby wig. It looked like a troll! Within like a second, it took it off."