"I put a little bit too much oomph into it," the actor tells PEOPLE

By Jacqueline Andriakos
April 27, 2015 11:10 AM

Ryan Guzman‘s character kept calm and cool during one adrenaline-pumping intimate moment in the thriller The Boy Next Door. But behind the scenes? It wasn’t quite as sexy.

The 27-year-old shared his most embarrassing experience while filming the R-rated scene with costar Jennifer Lopez, along with the hilarious reactions from his family members when they finally saw the dramatic thriller, which will be released Tuesday on DVD and Blu-ray. (See PEOPLE’s exclusive clip from the DVD above.)

“It was right before we get into the very, very steamy part of the film,” the actor tells PEOPLE. “My character has to pick up Jennifer – and me being stupid – I put a little bit too much oomph into it.”

And that little bit of oomph sent her straight into the ceiling, he explains.

“Let’s just say that the next couple takes, I was very, very gentle. She was a trooper. She hit her head, she came right back down, and she said, ‘Hey, I’m light. Just take it easy. You don’t need to muscle up.’ ”

Flubs aside, Guzman’s performance opposite the singer-actress, 45, impressed everyone back home – especially his dad.

“My dad went into a theater full of all my friends and family back home in Sacramento. Right around that part in the movie, he decided to get up and yell out, ‘That’s my boy!’ ” he says.

The sex scene was one of the most essential elements of the movie, director Rob Cohen explains in the behind-the-scenes clip.

“For me, the two most important things were to have the most sexual love scene that a movie star has done,” Cohen says of formulating the plot, which tells the story of a high school teacher (Lopez) who becomes romantically involved with her student and neighbor (Guzman), only to learn that his obsession is more dangerous than she thought.

“Then I wanted to have a climax that was truly the kind of violence that would emerge out of this situation,” he continues. “Sex, obsession, violence. That, to me, was the most interesting emotional path of the film.”

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