TEACHER BLOG
Changes in the Ratings System: The Abolition of the Hays Code By the late 1940s, the organization known as the MPPDA (Motion Picture Producers and Distributors of America) to administer the Production Code then became known as the Motion Picture Association of America (MPAA). Due to pressures emerging against the archaic censorship body, its president Jack Valenti (appointed in 1966) abolished the Hays Code in 1967. A new voluntary (or advisory) ratings system was established in 1968, initially with four uniform ratings categories to be enforced by distributors and exhibitors (including movie theaters): G (General Audiences, including children) M (Mature Audiences) R (Restricted, Children under 16 not admitted without parent or 'guardian') X (no one under 16 admitted) Soon afterwards in 1969, the M rating was changed to GP (General Patronage) and then to PG (meaning 'Parental Guidance Suggested') in 1970, and the age restriction was raised from 16 to 17. Most mainstream filmmakers would subsequently try to avoid a G-rating (other than Disney's animations and true family fare) in order to raise their ratings to PG - and thereby increase their desirability by adult audiences. Many foreign film-makers chose to not submit their films to the ratings board, since their films didn't have widespread appeal anyway and would only play in arthouse venues. From the late 60s on, filmmakers could expect an R-rating for most examples of female nudity and breast-fondling, but X-ratings for oral sex and other explicit sex acts or depictions.
The Hays code
http://www.artsreformation.com/a001/hays-code.html