J.Lo's Most Revealing Sex Scene Ever: "It Was All Me!

Stands-in just wouldn't work, Lopez said, because they needed things as close to real as possible.

"It was intense," she said. "Those scenes are embarrassing. They are uncomfortable, but your job as an actress or an actor is to make it believable and this movie in particular…hinges on if that was believable, that it was enough to make this guy go insane."

Before they shot the scene, Guzman says he told Lopez he was nervous because it was the first time he would be naked and doing such naughty things on camera.

"She was the one who kept me at ease," Guzman said. "She talked me down. She said, 'We're going to do this [and] we're going to do that. Everything is going to be fun. You're going to have fun.' It was."

Sure sounds like it—especilly when they had an unexpected "giggle fest" in bed.

"I looked at her and I think she started busting up laughing and then I started busting up laughing because she was laughing," Guzman remembered. "Finally, [Director Rob Cohen] was like after five minutes, 'Guys, let's get back to work.'"

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