Isn't the ancient brothel legal? Why did the Ming Dynasty "eliminate pornography"?

Brothel, a place like this, began to appear very early in ancient China, and it was not really banned by the state until the Republic of China. It is not difficult to find that brothels were legal in ancient China, but in the Ming Dynasty, a large-scale encirclement and suppression was carried out on this place. Why?

In fact, during the period of Zhu Yuanzhang, brothels in the Ming Dynasty were still very popular. At that time, many dignitaries would go to this place for entertainment, and even some activities similar to the current beauty pageant were held at that time to select winners. At that time, many rich families didn't like to deal with political affairs and stayed in these places all day!

This situation did not get another result until another emperor after Zhu Yuanzhang appeared. This emperor is Zhu Zhan. To tell the truth, Zhu Zhanji's martial arts is not outstanding, but he is very good at writing. After Zhu Zhanji succeeded to the throne, he began to encircle and clear these places on a large scale, and the main purpose of doing these things is to make the country more stable, and the second is to enhance the image of his country, but also to enhance the image of officials and let them do what they should do better!

However, the final result of this matter is not ideal. From the brothel of later generations to the demise of feudal monarchy, we can see that Zhu Zhanji's activities ended in failure. Although he has also formulated some systems, such as taking some concubines for officials according to their official positions, to solve this problem, this method has not achieved good results.