讲述一对美国夫妇去参加圣塞巴斯蒂安电影节，却双双出轨：妻子和一个有才华的法国导演发生婚外情，丈夫爱上了一个漂亮的当地女子。

　　When an encounter with the swinging scene has an unexpected impact on David's impotence, Alice thinks she might have found the solution to all their problems, but the poly-amorous world is a difficult place for a love story to flourish.