Before the Qing Dynasty in China, according to the Book of Filial Piety, it was said that "parents dare not damage their bodies, and filial piety begins". Shaving their hair was regarded as a criminal law, just like breaking their feet (it was said in ancient times that hair and feet were broken). In Qing dynasty, this hairstyle and braid were called "pig tail" in the west and "dolphin tail" in Japan. The names and foot-binding of dolphins and pigs have become the symbols of barbarism and backwardness, and have become the objects of ridicule and insult by foreign countries.
In fact, short hair in Europe is only popular in ancient Greece and Rome in southern Europe. It was not until the19th century that men in North and South Europe unified short hair.
In modern society, there is no law to keep hair, which is free. Women all over the world like to have long hair, which is the same as breast enhancement, beauty and wearing high heels. Professional women pay little attention to this aspect.