The great Helen Mirren even called one film 'an irresistible mix of art and genitals' - and if that's not a tantalizing description, we don't know what is. There are age differences, affairs, and drama taken straight from the pages of history. Some of the NC-17 movies included in this list feature fetishes, taboo kinks, BDSM, and unsimulated sex - aka actual sex, not the pretend version viewers usually see on screen. We're talking forbidden love, hot flashbacks to former lovers, will-they-won't-they relationships, and more. If you like your steamy scenes against the backdrop of a dramatic, interesting, or thrilling story, then these sexy movies are exactly what you need. To say these movies definitely turn up the heat would be an understatement. As for the difference between an NC-17 rating and a X rating? They pretty much started as the same thing - but because X ratings were coopted by the porn industry in the early 1970s, the term 'NC-17' was adopted in 1990 to replace it. 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.