R (MPA), Rating System Wiki

An R rated film is unsuitable for minors. In this case, content is not suitable for under 17 years of age. It is against the theater policy to admit unaccompanied minors to R-rated films. Those under 17 must be accompanied by a parent or guardian (at least 21 years old). It may include strong brutal and graphic violence (including blood), excessive strong language, nudity, and drug use. Although MPA ratings are theoretically advisory as it has no power to enforce ratings, the R rating is legally

MPAA Rating Bumper Rated R Remake (1970-1971) by TheAnthonyCorp on DeviantArt

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Motion Picture Association, Company Bumpers Wiki

57 Percent of All Films Got R Rating in Last 50 Years, MPAA Says

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R (MPA), Rating System Wiki

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PG (MPA), Rating System Wiki

MPA Film Rating System, Logopedia