She strips naked for some of the most explicit sex scenes ever seen in a mainstream movie – and is terrified of what her dad is going to think.

The shocking footage is so graphic Sienna admits she had to cover her eyes as she watched it on screen.

She said: “We wanted to make it realistic and I watched it thinking ‘Oh my God, my Dad’s going to see it!’ And that was going through my head.

But it was relevant to the story in that it’s a movie about the 60s, and sex and drugs and rock and roll were a big part of that. We didn’t want to hold back because it is a real film and it is a gritty film and there was a lot of shocking things and it wouldn’t fit in the film if we had an unrealistic sex scene. It was always a bit uncomfortable but I think it was relevant to the story.”

She added: “I think there were always concerns because it’s a vulnerable position to be in but, because Edie really had a problem letting men in, it was such a significant moment for her.

“I also believe that there’s nothing worse than seeing a sex scene where someone’s got a T-shirt on because its unrealistic so I think that if you’re going to do it, do it.”

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