Michael Fassbender lets it all hang out, literally, in director Steve McQueen’s naughty, grueling, NC-17 movie about sex addiction. Fassbender plays Brandon, a New York City resident who can’t get enough sex. He masturbates at work; he screws in public; and he loves his porn a lot. This makes things awkward when his sister (Carey Mulligan) drops by unexpectedly, bringing her problems with her. While the actors are giving it their all, there’s no real story here. It’s a character study, and that’s about it. It’s worth watching to see Fassbender and Mulligan acting up a storm, but there’s no real payoff. McQueen employs a mournful soundtrack that fortifies the mood, and the movie looks great—but a little more plot would’ve made it a great film.