Eight friends, all in stable relationships, venture into a game of sexual discovery by exchanging couples while trying to free themselves from their daily routines and add a spice to their love lives.

发生在墨西哥、关于爱和认同的四个故事：11岁的小男孩想要表达对表哥的好感，哪怕这意味着受伤；声望卓著的祖父在浴室中对男妓追逐爱慕，恨不得补回失去的时光；一对童年好友久别重逢，情不自禁的爱上后却害怕曝光；一份安稳的感情关系开始面对七年之痒，哪怕他们依然深爱对方...... 当它们交织在一起，就是“四个月亮”。