"Sex education" is very important, which is related to whether children can treat the opposite sex correctly, whether they have correct sexual concepts and whether they can have safe sex. But in ancient times, "sex" was very obscure and shy, but even Huanghua's eldest daughter, who had been raised in the boudoir for many years, could not know nothing about the opposite sex when she was about to marry someone else's wife, so before marriage, their mothers would take out their "wardrobes" and start personality education.

In ancient times, when a woman got married, her mother would prepare a big box for her daughter, which actually contained some paintings and ceramics. Ancient men and women were relatively conservative and had little education on their children's wedding knowledge. Only on the day before marriage will they tell women these things, which is also a realistic textbook.

The bottom of the wardrobe is an indispensable dowry when marrying a daughter in the past, so it is also called "dowry painting" or "painting". It is your own enlightenment "teaching material" on the wedding night, that is, the enlightenment painting is spread between pillows to show various postures for newlyweds, especially women, to visit and learn. In addition to giving reference to others, it also contributes to the role of feelings.

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Zhang Heng's "Simultaneous Songs" in the Eastern Han Dynasty describes women's experiences and feelings on their wedding night. It reads: "The clothes are off, the towel is powdered, and the picture is set. Motome is my teacher. She is very polite. " The "column diagram" mentioned in it refers to erotic paintings spread between pillows, which show the various postures of newlyweds, especially women, for them to visit and learn.