The Motion Picture Association of America (MPAA) serves as the voice and advocacy group that gives ratings to the content and end product of films in the United States.
The MPAA is a notoriously faceless group of parents with no movie business affiliation that rates content in judgment of how they feel the average American would classify the film. The group has caused plenty of controversy and criticism among filmmakers, studios and fans based on its categorization of certain films over the years. The MPAA, widely considered a conservative group, is notorious for harsh ratings (especially related to sexuality) and thereby censors the film industry and limits distribution and potential viewership for many films and artistic statements.
Check out these notorious ratings controversies.