"Monster's Ball" has become an enduring part of cinema history for two reasons -- Halle Berry's unforgettable Oscar speech and the iconic sex scene she shared in the film with co-star Billy Bob Thornton.

When Thornton dropped by HuffPost Live to discuss his Emmy nomination for "Fargo," he and host Ricky Camilleri chatted about what it was like to film that scene, which has become one of the most popular sex scenes on the Internet .

"It felt so real when we were doing it that [we felt] the heaviness surrounding the circumstances in the story," Thornton said. "I think maybe that's why it comes across so well on screen, because it was two desperate human beings in this moment alone, and we kind of were alone."

There's obviously some excitement in filming an intimate moment with one of Hollywood's sexiest women, but Thornton said because the film was so dark, he felt "pretty exposed" rather than titillated. Still, it was a thrill to work on, he said.

"When I was growing up, I obviously didn't know who Halle Berry was, but if I had known I would have made sure it happened. I would have written 'Monster's Ball' myself immediately," he said.

Watch the full HuffPost Live conversation with Billy Bob Thornton here.

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