Because marionettes simulate oral sex in "Team America: World Police," South Park creators Matt Stone and Trey Parker might see their movie getting an NC-17 rating. This rating can hurt movie attendance.
They have altered this oral sex scene 9 times for the MPAA. Producer Scott Rudin says: "our characters are made of wood and have no genitalia. If the puppets did to each other what we show them doing, all they'd get is splinters."
Parker wonders why the marionette oral sex scene is making such a big stir when the MPAA appears to overlook violent scenes such as when a fire is set on a Tim Robbins puppet and a Susan Sarandon puppet falls 20 feet off a building.