Sienna Miller Acting Virginal

Sienna Miller is afraid of steamy sex scenes in "Factory Girl".

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.

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."

Edie was a privileged socialite who became counter-culture icon Andy Warhol's close friend and muse at his Factory art studio. She died at the age of 28. In the film, Sienna's steamy scenes are with Hayden Christensen who portrays a folk singer based on Bob Dylan, who had an affair with Edie but who the film makers have given another name for legal reasons.

Sienna said of Edie: "She fell head over heels in love with him and then had her heart broken. It was so sad."

Sienna and Hayden struck up an off-screen friendship and dated while they were on location filming in Louisiana.

But she says since her romance with Law ended there has been no special man in her life. "It is hard to even find the time to think about it because I have done five films this year and it's hard to focus on my personal life," she said.

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