在許多婚姻中，許多伴侶都會在七年的時候不安躁動。四對情侶將會與陌生人同居兩週實行試驗婚姻，這時的他們站在十字路口，測試著加入一些變化是否能讓他們的婚姻更加穩固。
Seven years marks a point in many marriages when couples find themselves restless and dissatisfied. Four couples at a crossroads in their relationship will live with a stranger for two weeks, in an experimental marriage, to determine if different traits in a mate could make their marriage stronger.
