This unsung genre runs the gamut from drama, to comedy, to porn disguised as mainstream (looking at you, 9 Songs). But one thing they all have in common is sex. Pure and simple. And a lot of it. And it's not just that the director chose to show it. No, the whole plot centers on it. And, frankly, we are here for it. Because sex between two consenting adults is a beautiful thing.
(P.S. I'd like to issue a public apology for use of the phrase "sex iceberg.")