在中國古代，滿嘴鬍鬚是男人的特有標誌之一，如今審美觀的改變，使得大部分現代人都保持了刮鬍須的習慣，但是在古代男人是不能隨意剃掉鬚髮的，因為沒有鬚髮的男人，會被視為不孝和沒有男子氣概，對每個男人來講就是一種侮辱。
《孝經》有云：“身體髮膚，受之父母。”在古人眼裡，整個人都屬於父母，就算腦袋上長得頭髮也是，所以在古代隨便剃鬚或剪髮的會被視為大不孝，這樣的人是會被看不起的，更是一種侮辱。
還有一種說法，鬚髮代表著男子氣概，沒有鬚髮的男人就是我們現在所說的“娘炮”。試問，堂堂一個七尺男兒被人說是娘炮，你能不氣嗎？這不是侮辱嗎
如今，影視圈上那麼多小鮮肉，有些娘裡娘氣的，實在是辣眼睛。古代的太監是沒有鬍鬚的，因為太監被閹割之後體內不能產出雄性激素，不能刺激鬍鬚的生長，所以太監被稱為陰陽人。
而古代硬漢都有一副又長又硬的鬍子，例如《三國演義》裡的張飛、《水滸傳》裡的李逵。古人的審美通常以長鬚為美，因此對這類人是非常崇拜的，鬚髮帶來的氣質讓人看著都害怕。
古代有個刑罰叫髡(kun)刑，簡而言之就是剃光犯人頭髮和鬍鬚。用現在的眼光看，這算什麼懲罰？不就是理髮和刮鬍子嗎？但對古人來說，這對男人足矣造成嚴重的精神傷害。受了髡刑的男人，一張臉光禿禿的，走在大街上，顯得與周圍的男性截然不同，這就是侮辱，人群中一眼就能看出來這個人的不體面。
歷史上朱元璋的兒子朱檀就受過這種罪，要知道當時朱檀犯下的可是重罪！濫殺小孩，只為了修煉金丹。這放在其他高官重臣身上，沒有株連九族也死罪難逃，但畢竟是皇子，為了給下面人交代，朱元璋因此才實施髡刑，足以見得這種不受疼痛的刑罰對古人來說有多可怕。
總的來說，男子剃掉鬚髮就是一種對精神上赤裸裸的侮辱。
英語翻譯：In ancient China, full mouth beard is one of the unique signs of men. Nowadays, the change of aesthetic standards makes most modern people keep the habit of shaving. However, in ancient times, men can't shave their hair at will, because men without hair will be regarded as unfilial and without manliness, which is an insult to every man.
"Filial piety" says: "the body hair skin, by the parents." In the eyes of the ancients, the whole person belongs to his parents, even if he has hair on his head. Therefore, in ancient times, people who shave or cut their hair casually will be regarded as great unfilial. Such people will be looked down upon and even more insulted.
There is also a saying that bearded hair represents masculinity. A man without beard and hair is what we call "Niang gun". Just ask, a seven foot man is said to be a Niang gun, can you not be angry? Isn't that an insult
Nowadays, there are so many fresh meat in the film and television circles. Some of them are really hot. In ancient times, eunuchs did not have beards. Because eunuchs could not produce androgen and stimulate the growth of their beards, eunuchs were called yin-yang people.
In ancient times, tough men had long and hard beards, such as Zhang Fei in romance of the Three Kingdoms and Li Kui in Outlaws of the marsh. The ancients usually took long beard as beauty, so they worshipped this kind of people very much. The temperament brought by hair and beard made people afraid.
In ancient times, there was a punishment called Kun punishment. In short, it was to shave the hair and beard of prisoners. What kind of punishment is this from the present perspective? Isn't it just a haircut and a shave? But for the ancients, it was enough to cause serious mental harm to men. The man who had been tortured by Kun, with a bald face, walked on the street and looked quite different from the men around him. This was an insult. One could see his disgrace at a glance in the crowd.
In history, Zhu Tan, the son of Zhu Yuanzhang, suffered this kind of crime. You should know that Zhu Tan committed a felony at that time! Killing children indiscriminately is only to cultivate the golden elixir. This is on the other high officials and important officials. Without the involvement of the nine clans, it is still the death penalty. After all, it is the prince. In order to explain to the people below, Zhu Yuanzhang carried out Kun punishment, which is enough to show how terrible this painless punishment was to the ancients.
On the whole, shaving a man's hair is a stark mental insult.