Darryl's parents haven't had sex in a month, so they head to a couples retreat for the weekend. Darryl thinks the couples retreat will ruin his parents marriage, so he decides to follow them up there with Yvonne... and of course Dave and Sally come too. After Darryl's parents start threatening divorce, they rediscover their passion and spend most of the weekend in bed. Darryl, however, in the spirit of honesty and communication fostered by the retreat, tells Yvonne about some of his methods for not listening to her. Yvonne shoots back with some harsh honesty of her own and they have an all-out fight. They realize that their marriage has worked just fine for the last 15 years with them being honest about the things they like about each other, and just keeping quiet about everything else, so if it isn't broken they shouldn't fix it. (thetvdb.com)