The long pubic hair belongs to the second sex characteristics, no matter boys or girls, most of them start to grow pubic hair gradually after the sexual organs develop and mature during puberty, girls develop earlier, about twelve years old after the beginning of menarche, they start to grow pubic hair. The long pubic hair is a normal physiological phenomenon, most people will have, but a small number of people will also appear not long pubic hair is also normal, whether the long pubic hair and the number and length of pubic hair is mainly related to the amount of androgens in the body, female long pubic hair has a protective effect on the vagina, can play a natural barrier role, to prevent germs and pollutants infection, for health benefits. If the pubic hair has not changed much, but suddenly the pubic hair grows more and longer, it is probably a problem of endocrine secretion in the body, it is better to do the six hormone tests for women to confirm whether there are endocrine abnormalities.