Kissing Buddies(2010)

Sara and Chris are a monogamous married couple. They're both become victims of the daily grind, and somehow, their sex has become... typical. Sara's cousin Jessica comes for a visit, and suddenly, things are turned upside down. As Jessica fucks and sucks her way around the neighborhood, a fire begins to burn within Sara, a fire that hasn't been allowed to breathe for years. Sara is forced to confront her past face, as years of tamed desire and yearning flow freely once again.