"Rated X" is a term used to classify films, videos, or other media that contain explicit adult content, particularly sexual material. This rating indicates that the content is intended for mature audiences only and is not suitable for children. The "X" rating originated in the United States in the 1960s and has since evolved, with various organizations creating their own systems for categorizing adult content. In the film industry, "Rated X" can also refer to specific movies that were produced during the adult film boom of the 1970s and 1980s. Notable examples include films like Deep Throat and Behind the Green Door, which gained mainstream attention and sparked discussions about censorship and sexual expression in cinema.