Motion Picture Association of America – Movie Ratings (this was later changed to 17) X rated movies were for adult audiences only. they are derived, and what they mean for your family, please visit the MPAAwebsite at Dec 21, - Page 1 within the bowels of the Motion Picture Association of America is a man named. Wallace McEntyre and he, and he alone, . of children to books and films that could not be denied to adults. THE. RATING. SYSTEM. 4.