Zhou Zuoren has long been concerned about the issue of sex,which could be traced back to his study in Jiangnan Naval Academy in 1902.After that,he went to Japan to study and had personal experience of modern sexology thought in Japan and the West.Returning to China in 1911 and joining Peking University in 1917,Zhou Zuoren's purchase of Western books increasingly involved modern sexuality works.In 1922,Yu Dafu's Sinking and Wang Jingzhi's Wind of Hui were criticized as"immoral"works because of their sexual writing.In this case,Zhou Zuoren made a"defensive"response to the suspicion of"immorality"in the two articles Sinking and Love Poem,which was actually a counterattack against feudal old morality with his modern sexuality thought.Zhou Zuoren wrote many articles such as Love of marriage,Words of Ailis,Spiritual Communication and Play of Emotion,etc.,conducting a comprehensive and systematic study on sexuality,involving sexual morality,women's sexual standard,children's sexual education,gender relations,transgender,abnormal sexual psychology and many other aspects.Zhou Zuoren's two responses to the"immoral"accusation in 1922 were the prelude to his systematic study of sexuality.