X-rated

X-rated idiom
Sexually explicit, vulgar, or obscene, as in This film should be X-rated; it's not suitable for children. This expression alludes to a rating system established for motion pictures, in which films rated X may not be viewed by persons under the age of 17. [c. 1970]

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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