The Promise PORN! In a mainstream cinema. With paddles and whips and ropes and all manner of naughtiness that you'd never usually get outside of a theatre where the floors had to be rigorously mopped every couple of hours. Or at least a satisfying adaptation of the terribly written, improbably popular mommy porn books that provided the source material. It would surely be one or the other (well made or so erotic nobody would care for the furious sinning they'd be doing). The Problem The split agenda to be both mainstream and erotic meant that the bits that were supposed to be rude were sterilised (missing out on the main selling point for the book, whether the buyers care to admit it or not) and the bits designed to make it a "real" film were undercooked. For two characters who were supposed to be aching to put bits of themselves in each other, Jamie Dornan and Dakota Johnson had no chemistry to speak off and though the sex scenes were artfully shot it just wasn't convincing. Because - incredibly - sometimes the most erotic things happen in the imagination without having to see them on screen. Which other 2015 films belong on this list? Share your own assessments below in the comments thread.