Sex education in China rose to the national level, which began in the fourth year of the Eastern Han Dynasty (AD 79). At that time, Liu Xiu, Emperor Guangwu, presided over a national academic conference on Confucian classics, and made standard answers to various questions of Confucian classics, which was compiled by Ban Gu into a book "White Tiger Tongdelun".

Related information:

It is clearly stipulated in the book that aristocratic children must study etiquette, music, dance, poetry reading, writing, archery, horseback riding, horse-drawn carriage and other courses in Biyong Academy, and also receive sex education.

Because sex education is a special kind of education, it can't be avoided or carried out in a big way, so the ancients came up with many quick ways to "draw a tiger according to a cat". The Dowry Painting is one of them. The "dowry painting" was first seen in pre-Qin tombs, and there were also a large number of Han bricks. The production of physical objects continued until the early Republic of China. "Dowry Painting" is generally a roll of 8 paintings, 12. Before the daughter gets married, both parents should buy one or two rolls as dowry.