“The whole movie is lovemaking between the characters,” Diaz tells PEOPLE. “The crew was awesome and so respectful. It’s not a vanity thing. It’s about telling a story.”
In the film, out July 25, Diaz and costar Jason Segel play a married couple who film themselves trying out every position in The Joy of Sex, only to have the tape go missing.
“There’s such trust [with Jason],” says Diaz. “We both had each other’s backs. Our day was, ‘My ass is going to be in your face and your package is going to be in my face!’ ”
Which took some, ahem, selective wardrobe decisions.
“We call them modesty garments,” Diaz says. “My dresser and I got really intimate. Double-stick tape can be the difference between the whole world seeing your goods!”
And the subject matter certainly provided for a lot of laughs.
Says Diaz: “Sometimes I would stop in the middle of a scene and go, ‘Everybody hold on! Do you realize we’re getting paid to do this?’ We had such a fun time laughing our asses off, having such gratitude that this is our job. We get to be idiots all day long and tell a really sweet story at the same time.”