Swung (2015) on Netflix

Plot summary

David's marriage is ending, his money has run out and he cannot perform in bed. Alice, his girlfriend, stands by him while the publication she works for loses readers and demands a story from her. Searching for work online, David comes across a swingers site and signs up out of boredom, and the crude invitations that follow upset Alice. She sees the material as the reporting chance her office has been pressing for, and her colleagues urge her to explore the scene. David is reluctant to take part. Their first encounter with the scene is awkward, yet the pair carry on.