R-rated movies can get away with showing a lot of ... This is slightly different from an NC-17 – Adults Only rating. In that type of rating, no one under 17 is allowed to enter the theater.

(While the MPA allows people under 17 to see an R-rated movie if they’re accompanied by a parent or guardian, no one aged 17 and under is admitted to an NC-17 movie.) Similarly, no one younger ...