Tone It Down Through Sound

The stars of Twilight Saga: Breaking Dawn - Part I explain how sound can tone down an R-rated movie to PG-13 (text of interview requires purchase from Entertainment Weekly):

Robert Pattinson: It was really Kristen's fault it was going R-rated. [To Kristen Stewart] Your fancy moves--no one's seen moves like that in a PG-13 movie! [Laughs]The thing about ratings is, it's about noises.

Kristen Stewart: Like if his thrust coincided with my ohhhh--that's not okay.

Pattinson: If a sex scene is rated R, the first thing you do is take out the sounds and put music over it. Same thing if there's a horror scene; you take out the screams.

Taylor Lautner: Or in an action scene, if you're punching someone in the face you take out the sound effect of the fist making contact.

Take out the actual sounds, put in some music, then it's safe for kids. Like political commercials.