In this time and space, the number of men in the population has been greatly reduced due to an infectious disease. Women have gradually become the masters of the country and society, while men have slowly degenerated into tools for carrying on the family line.
In this case, a strange marriage system emerged, monogamy and polyconcubine. Women could become female concubines, which was allowed by law, and concubines could also have sexual relations with their owners' husbands, and the children they gave birth to were considered bastards.