As we know from our interview with Lucy Punch, former flames Cameron Diaz and Justin Timberlake got along like gangbusters on the set of Bad Teacher. As for whether it was awkward for the exes to shoot their big dry-hump scene, we asked Diaz at the Ziegfeld Theatre premiere this week: "We were trying to make it awkward," she told us. "It’s the least sexiest sex scene ever. There’s no chemistry between these two people, between our characters. And think about it: That was safe sex! [Laughs.] It’s seriously a public-service announcement. Everybody should dry hump — at least once a day. You can do it anywhere." We also got her take on the sexy car-wash scene we dissected earlier today with the help of a professional car washer. "That scene was so hard," she said. "I felt like Evel Knievel. You know how hard it is to do that?" For more quotes from the red carpet, click through our slideshow.