Requiem for a Dream, The Dreamers, and Blue is the Warmest Colour are all among the best NC-17 movies all adult movie fans need to watch.

The NC-17 rating is seen as taboo, but it lets movies explore the darker parts of human life, like in the films Perfect Blue and Mysterious Skin.

Basic Instinct, Scream, and American Psycho are among the best, boundary-pushing R-rated movies that were nearly slapped with an NC-17 rating.