From parents and teachers to politicians and policymakers, there is a din of voices participating in the debate over how young people are affected by violence, strong language, and explicit sexual activity in films. The Motion Picture Association of America (MPAA) responded to this concern in 1968 when it introduced a classification and rating system based on the now well-known labels: "G," "PG," PG-13," "R," and "X." For some, these simple tags are...