At first there is passion and desire, but over the years, the lust for each other tends to decrease and sometimes disappear entirely. Some deal with this problem by having their needs met elsewhere, while others simply come to terms with their sexless lives. In some cases the lack of passion leads to divorce. 37 Grad accompanies three couples who speak openly about these issues. They take the viewer on a journey to find the root cause of their problems and attempt to rekindle the flame of passion.