In a behind-the-scenes interview with Entertainment Weekly, the co-stars admit they weren't trying to be sexy while filming scenes in bed together.
"I think we were really kind of spur of the moment with it," Segel said. "What was really amazing about doing it with Cameron is I think she and I come from a similar place when it comes to comedy. We don't have a tremendous sense of pride or shame."
"It was really like doing it with a buddy, which was cool," he added. "And the thing about the sex tape, they need to be embarrassed that it gets out...we really didn't want it to be sensual or sexy."
Diaz added, "You wanted it to be kind of ridiculous, and absurd and humiliating."
As for how they choreographed their hilarious sex positions, Diaz said, "We kind of made s--t up as we went along." Segel dished, "I know this will shock your readers, but it turns out there's a finite number of ways my body's able to move."
And for the record, Diaz and Segel say there were no injuries during the filming of the more acrobatic sex moves.