This is going a step beyond method acting. If you're actually doing it -- and by it, we mean having sex on camera -- is it really acting at all?

There are a number of stars rumored to actually have had sex during their love scenes in films, and there are even a few where it's no rumor at all:

Loading Slideshow...
  • Chloe Sevigny

    Forget rumors, actress Chloe Sevigny really performed oral sex on writer/director/co-star Vincent Gallo in the 2003 film "<a href="http://www.imdb.com/title/tt0330099/">The Brown Bunny</a>."

  • Shia LaBeouf

    Shia LaBeouf has already appeared nude on screen and now he's about to get it on -- for real -- on camera as well. The actor has signed on to appear in Lars von Trier's upcoming film <a href="http://www.huffingtonpost.com/2012/08/18/shia-labeouf-nymphomaniac-scenes_n_1801022.html">"Nymphomania," which will include unsimulated sex scenes.</a>

  • Donald Sutherland & Julie Christie

    Actors Julie Christie and Donald Sutherland were rumored to have actually engaged in sex during an explicit love scene in the 1973 film "Don't Look Now." In 2011, former Variety editor Peter Bart claimed in his book "Players: A Tale of Movies, the Mob, (and Sex)," <a href="http://movieline.com/2011/03/24/the-mystery-of-julie-christie-and-donald-sutherlands-sex-scene-in-dont-look-now-solved-nsfw/">that he visited the set of the film </a>and, "It was clear to me they were no longer simply acting: they were f*cking on camera." His allegations were denied by Sutherland, who told the New York Daily news that his claims were "not true. None of it. Not the sex. Not him witnessing it."

  • Sienna Miller & Hayden Christensen

    Sienna Miller and Hayden Christensen are rumored to have blurred the line between their on screen and off screen romance in the 2006 movie "Factory Girl." <a href="http://www.mtv.co.uk/news/sienna-miller/39959-sienna-i-didnt-have-sex-on-screen">Miller denied the rumor telling MTV</a>, "I take it as a compliment. I dont want to do a sex scene that doesnt look real, because thats my job," she said. "But I'm not about to have sex in front of 20 people with the cameraman and a man with a mic there and George (Hickenlooper, the director) sniggering."

  • Kieran O'Brien & Margo Stilley

    Kieran O'Brien and Margo Stilley have <a href="http://www.nerve.com/dispatches/nerveeditors/50-worst-sex-scenes/damage-monster-s-ball-in-the-cut-the-life-of-david-gale-9-songs">plenty of real sex in director Michael Winterbottom's 2004 film "Nine Songs." </a>

  • Marilyn Manson & Evan Rachel Wood

    Sources claimed that Marilyn Manson and Evan Rachel Wood weren't faking their sex scene in his 2007 music video for the song "Heart-Shaped Glasses (When the Heart Guides the Hand)." <a href="http://www.mtv.com/news/articles/1559650/marilyn-mansons-sex-scene-stellar-acting.jhtml">Manson played coy about the rumors, telling MTV: </a> "Let's say there were some conservative people involved [with the video] that got a little upset about things that were taking place, and there's been rumors back and forth, but I will not confirm or deny them," he said. "I did insist that Evan be paid the most that any actress has ever been paid in music-video history to be in this, even though she wouldn't have asked for it. There's no one else that could've been in it, because it was inspired by her."

  • Notorious B.I.G. (WARNING: EXPLICIT NSFW AUDIO)

    In an interview with HuffPost blogger Barry Michael Cooper in 2009, P. Diddy <a href="http://www.huffingtonpost.com/2009/03/09/p-diddy-comes-clean-on-no_n_173312.html">confirmed that Notorious B.I.G. actually received oral sex</a> from a woman so that he could produce authentic sounds for the song "Ready to Die." "In the interlude, is Big actually getting some head?" Cooper asked and Diddy responded: "Yeah," and laughs. He continued, "These are questions that nobody's ever asked, and I think Big would be alright with it."

Related on HuffPost: