Not porn, obviouslyMore
This 2006 comedy is one of the better-known movies of this particular subgenre. The film centers on the happenings at an artsy sexual salon in Brooklyn, and chronicles one woman's very explicit adventures in trying to achieve orgasm. (FYI, actress Sook-Yin Lee was almost fired from her radio gig because of this movie, but kept her job thanks to the support of A-listers like Gus Van Sant, Francis Ford Coppola, and Yoko Ono.)
If you like your unsimulated sex with a side of hipster angst, look no further than 2005's 9 Songs. The film is essentially about a couple who a) attend concerts by aughts bands like Franz Ferdinand and The Dandy Warhols, and b) have a ton of sex. And it's very, very real.