After the establishment of monogamy, when women become accessories and tools of men, wives have many obligations to their husbands. One is to have children for her husband, and the other is to be chaste for her husband. Of course, there are many other obligations, but these two obligations are the most important and relevant in group marriage and hybridization in primitive times.
Chastity has always been a woman's, which is the requirement of men as rulers and women as rulers. At most, men's flirting is considered "immoral", not "unfaithful", and even considered romantic. Once a woman "loses her life", it is impossible for any reason.
In ancient China, women's chastity had a development process: after Qin Shihuang unified China, he traveled around the world, set up tablets and carved stones in some places, carved famous sayings such as Mount Tai, Wolf Mountain and Huiji, and declared himself to the world. These places all mention women's chastity. For example, Huiji carved a piece of Shi Yun as the propaganda of the whole province: Give birth to a son, get married and die twice. Adultery is prohibited to prevent internal and external separation.
However, after the mid-Song Dynasty, the situation was different. With the support and advocacy of the rulers, Neo-Confucianism in Zhu Cheng rose. Under the guidance of the idea of "observing heaven and justice and destroying human desires", they strongly advocate women's chastity and widows are not allowed to remarry.