Xiao Bo lives in a world where the lines defining men from women are constantly dissolving. He kneels at the deathbed of his father who has become a woman, and whose dying wish is to have oral sex with his/her son. His boyfriend Nana has also undergone a sex change, but Xiao Bo no longer finds her attractive as a woman. A sexual chain reaction ensues that wreaks havoc on traditional Chinese roles that govern male and female, parent and child.

小博的父亲临终之时要求他以精液为乳汁送他远行。小博做到了。他没有做到的是满足变了性的娜娜与他共同生活的愿望。娜娜从此放浪形骸，与遇上的每一个男人都谈情说爱，直至上床。在墓地，她陪同小博去扫墓时才幡然醒悟。不过，没有人知道她是否能找到一个喜欢同她安居乐业的男人。与娜娜在一个家庭聚会上擦肩而过的冬冬是一个高中学生。他的妈妈如梦令变性成了男人，但仍旧与他的继父大宇同居在一起。冬冬体验了一夜不归的生活之后...