Those under 17 can get into R-rated films (think ' 50 Shades of Grey') if they're accompanied by a parent or guardian. The biggest difference between it and a movie that receives an R rating is that no one under age 17 can watch NC-17 films in theaters. Porn with a plot is absolutely a thing, and it's basically an NC-17 movie. If you love a movie filled with raunchy sex scenes, this article is for you.