A bored couple takes a shot at swinging in order to spice up their bland sex life and save their failing marriage in this playful sex comedy starring Martin Freeman and Mandy Moore. Alvin (Freeman) and Ellie (Moore) were in college when they first met. Back then, they couldn't get enough of each other. A few years into their marriage, however, lust gives way to lethargy, and neither can muster enough passion for a satisfying round of earth-shaking sex. Meanwhile, Alvin and Ellie's friends Peter (Jonathan Silverman) and Janet (Melissa George) are having relationship problems of their own. And when an incident with Ellie and a cucumber goes hilariously awry, she suggests that sleeping with another couple may be the best way to reignite their passions for one another. Unfortunately, finding the perfect pair for some naughty fun proves a bit more complicated than Alvin and Ellie anticipated. Upon settling on a playful couple (Angus Deayton and Daisy Beaumont), who seem to have their heads screwed on straight, the clothes come off and the real fun begins.