It was stipulated in the Qing Dynasty that when the prince was about to get married, eight elderly ladies-in-waiting should be selected to educate the prince about breaking the bed. These ladies-in-waiting would not need to do some menial work in the future, and they would receive a monthly salary.
Besides these ladies-in-waiting, it is also possible that they were educated by their wet nurses. After all, these princes were raised by wet nurses, so they have a deep relationship with wet nurses. It is also appropriate for the wet nurse to educate them. There was a prince in history who wanted his wet nurse to be the queen after he ascended the throne.
In history, there is another wonderful thing to educate the prince in bed. The emperor asked his concubine to educate the prince. Jin Huidi was afraid that his son didn't know about the bed, so he sent one of his concubines to educate the prince. As a result, the princess got pregnant.
Another way is to look at erotic pictures. There are a lot of erotic pictures in the palace, just to let the prince study when he needs these educations.
Not only the prince, but also many folk families transmit sex education to the younger generation of the family in this way.
Moreover, there was a Buddhist temple in the Ming Dynasty, and the Buddha dedicated to it was called Huanxi Buddha. This happy Buddha is a Buddha statue where men and women embrace each other, and it is also to enlighten the prince's sex education.
There are also many erotic pictures carved on the wall of this Buddhist temple. It is said that these erotic pictures are lifelike. Before the wedding, every prince will go to this Buddhist temple to worship Buddha for a few days, in order to get to know the skills in bed, otherwise nothing will happen in the bridal chamber, which is really embarrassing.