Actress Jennifer Lopez has shot for several bold sequences in her career, but she says she was uncomfortable filming sex scenes for her new thriller "The Boy Next Door".

In the film, she plays a high school teacher being terrorised at home and at work by a much younger man, played by Ryan Guzman, whose onscreen character becomes obsessed with her after a one-night stand.

In one of the scenes, she strips down to just her underwear and Guzman is seen grabbing her bare chest and sliding his fingers between her legs.

Lopez didn't think of using a body double for the "intense" scene.

"It was all me. And all Ryan, by the way," eonline.com quoted Lopez as saying.

"It was intense. 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," she added.