Everyone has hair on their body, and the one that grows down there is called pubic hair. But why is it curly, not straight? This natural curly hair, its own volume of reason. 1, its physiological function determines that it is curly hair rather than straight hair first, genetically decided that the hair below is curly, not straight. The hair of the private parts of the small skin skin pattern, is horizontal and inclined, and the hair of the hair of the small skin form is different. Secondly, pubic hair can do a lot more than hair. Not only does it keep you warm and absorb sweat, it also has these roles: ① regulates temperature and protects sperm. The presence of pubic hair can to a certain extent ensure that the testicles are at a normal temperature, to avoid the occurrence of high or low temperature, which affects the quality of sperm. ② Reduce the discomfort caused by friction during lovemaking. The presence of pubic hair can also cushion the pain that occurs during sex due to repeated friction. Imagine if the pubic hair is particularly flat, it may make the surrounding skin tingle or have other effects. ③Help the private part to dissipate heat. Because the pubic sweat glands are very developed, sweating more, fluffy and curly pubic hair can play a good role in ventilation. The flat pubic hairs usually droop together and the breathability may not be as good as the curly pubic hairs that branch up. In short, these physiological functions of pubic hair and along with its continuous natural evolution, decided its curly form. 2, long-term pressure by clothing cover, and become curly state pubic hair and armpit hair, hair, are skin hair, and at the same time with the armpit hair, also belongs to the short hair hard hair, and because in this location of the person and more private, usually people are to wear a special protection of its underwear and clothing for The hair on the bottom of the body is also short and hard. And for the following hair, long-term underwear and clothing this cover pressure, the natural will become a curly state, at the same time, will not be infinite growth. If for the hair, wear a hat every day, long-term extrusion by external forces, and in the case of relatively short hair, may also form this curly state. So, do not have to be too obsessed with why it is curly this thing, it has its own reason for the volume.