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Castration, also known as yin punishment, refers to the punishment of men or women in the vulva.

In ancient China, the origin of castration was quite long. There is evidence that there was the consciousness and behavior of castrating male genitalia at the latest in Yin and Shang Dynasties. At that time, castration may have cut off the penis and testicles at the same time The castration technology in Qin and Han dynasties was relatively complete, so pay attention to the nursing measures such as windproof, warmth and rest after castration. At that time, the place where castration was performed was called "Silkworm House", and Yan Shigu noted in "Biography of Zhang Hanan": "Anyone who raises silkworms wants them to grow long and warm early, so hiding fire is a secret room. There is also a trick to the new corruption punishment. It is complete to enter the secret room, because it is called the silkworm room ear. " Roughly the same explanation can be found in Li Xian's note in Emperor Guangwu of the Later Han Dynasty, which says that "eunuchs are afraid of the wind and need to be warm, so they pretend that the fire storage room is like a silkworm room, which is named after the name". Castration is a kind of corporal punishment, and its cruelty is second only to that of the great emperor. The reason for this is, of course, because people at that time thought that the value of genitals was second only to that of the head. This understanding is correct even today.