Fact one: People have sex. Fact two: Because sex is a natural human experience, some movie directors opt to include it in their films—unsimulated—for a heightened sense of realism, which means you're looking at real people having real intercourse.
Here are 25 movies that broke taboos for just that. This era film features an insane amount of unsimulated sex, including a threesome and an orgy. Fun fact: Other fun fact: This art house film is about a thai stocking girls whose boyfriend won't have sex with her, causing her to start looking elsewhere.
And yes, it features unsimulated sex throughout.