Explain later:
The first refers to the so-called homosexuality of women in today's palace (ancient lesbians are also called grinding mirrors); Those maids who are not favored by the emperor are of the same sex as women because they are not allowed to contact the opposite sex in the deep palace; Second, it also means that maids and eunuchs form a nominal husband and wife. Based on the colorful network language of modern society, eating is also interpreted as "eating face to face" between people.
Etymology:
The word duality originated in the Han Dynasty. "Hanshu" records: "courtiers, Daofang and Zhang abandoned it, so Zhao's imperial envoys include Hakka, Wang Yong and Zang Ai. All of them are called Gong (Cao Gong) knowing his son, and they belonged to Zhonggong before. In order to learn the history of things, they studied the Book of Songs and awarded it to the Queen. The temple (Taoist room) is opposite to the palace (Cao Gong). " Ying Shao pointed out: "Imperial secretaries are jealous of each other because they eat the names of couples." It can be seen that the opposite food originally refers to lesbians. Chen Ajiao, the queen of Emperor Wu of the Han Dynasty, also recorded a similar story: "A witch wears men's clothes and clothes. She lives with the queen and loves her as husband and wife." "After the incident, the Queen of the Chu government abolished the general manager of the palace." However, it is recorded in unofficial history's novels, and its authenticity is doubtful.