pubic hair

Guobule CPO physiological health network

Girls also begin to grow body hair at puberty. Girls first grow pubic hair in the vulva, which is the first change that some girls notice after entering puberty. Just as doctors divide the development of male sexual organs into five stages, they also divide the development of female pubic hair into five stages. 1 Stage is childhood, starting from the birth of a girl and continuing until the arrival of the second stage. At the 1 stage, girls will not grow any body hair. In the second stage, the fine hair of the boxing song began to grow. At this time, her age is generally around 1 1 year. In the third stage, pubic hair becomes darker, more curved, denser and covers a larger area. The age of girls entering the third stage is about 12 years old. In the fourth stage, the age is generally 12 or 13 years old, the color of pubic hair continues to deepen, the fist bends more seriously, and the coverage area continues to expand. The fifth stage is adulthood. The fully developed pubic hair is distributed in an inverted triangle. A few women even have pubic hair near the lower edge of the abdomen or buttocks. Generally speaking, girls at this stage are about 14 years old.

Does the absence of armpit hair or pubic hair in women affect sexual function and fertility?

There are girls who have menstrual cramps for many years and have normal physical development. The only drawback is that they have no armpit hair or pubic hair. As a result, she was embarrassed to take a bath in the public bathroom. She was ashamed and worried all day, so she wrote to ask if marriage would affect her sexual function and fertility. Is there any way to make them grow pubic hair and armpit hair?

First of all, we seriously discuss the growth process and mechanism of female body hair (pubic hair and armpit hair).

Normal women have less body hair than men, and there are great individual differences in color, length, thickness and density. Of course, it is also related to factors such as race and age. For example, the body hair of orientals is obviously thinner than that of white people in Europe and America. In addition, the distribution of female pubic hair is not all typical inverted triangles, but also shield-shaped, rectangular and inverted trapezoidal. Pubic hair is one of the signs of sexual development, which generally coincides with the beginning of breast development. Its growth can be divided into five stages:

The first stage: before 1 1 year old, there is no pubic hair growth, only fine hair distributed on the pubic mound, which is light in color and called childish type.

The second stage: 1 1- 12 years old, pubic hair began to sprout under the stimulation of sex hormones, first in the labia majora and then in the pubic mound, and the pubic hair was light, thin, soft and straight.

The third stage: 12- 13 years old, the color of pubic hair deepens and begins to thicken, harden, thicken, lengthen and curl, covering the pubic triangle;

The fourth stage: 13- 14 years old, continues to become dense, similar to the appearance of adult women, and its upper edge is mostly confined to the pubic mound, which has not yet expanded to the inner thigh and no longer expands upward.

The fifth stage: 14- 15 years old, pubic hair is densely covered, the whole vulva is covered, the labia majora covers down the pubis, meets the anus, and reaches the inner thigh, which is a typical adult female pubic hair.

The appearance of axillary hair is late, which is usually the last appearance in the process of female secondary sexual characteristics. The vast majority will not grow up until 17 years old.

The growth of human hair is mainly controlled and restricted by androgen and estrogen. Androgen and estrogen have specific stimulation or inhibition effects on hair growth in different parts of the body, so the distribution of hair between men and women is different, while other primates rarely have such gender differences, and the mystery is still difficult to explain. For example, estrogen promotes the growth of hair, while androgen inhibits the growth of hair on both sides of the forehead, so men's hair is not as thick as women's, showing a specific concave hairline. For another example, androgen stimulates the growth of beard and chest hair, while estrogen inhibits their growth, so men have beard and chest hair (rare for yellow people), while women have neither. Estrogen and androgen can stimulate axillary hair and pubic hair, so both men and women have axillary hair and pubic hair growth (although the distribution characteristics of male and female pubic hair are different). The growth of body hair in men and women is mainly controlled by androgen (dehydroepiandrosterone) secreted by adrenal cortex. When female adrenal cortex function is low, hair will fall off, and hair can be revived after androgen injection. When a man has his testicles removed, his beard stops growing, but his armpit hair and pubic hair remain unchanged.

So why don't some women have pubic hair and armpit hair? One of the reasons is the low level of androgen in women; The second reason is that the receptors receiving androgen in pubic and axillary hair follicles are insensitive to androgen or have other defects, and some of them are not at all. When pubic hair and axillary hair are highly sparse or missing, it is called alopecia, accounting for about 2.5% of the population. The endocrine, menstrual cycle, sexual development, sexual function and fertility of most women with alopecia are normal, so alopecia is physiological and will not affect their health and happy marriage, so don't worry, let alone believe rumors.

It is worth mentioning that there are also a few cases of alopecia that are pathological, such as Turner syndrome, in which the chromosomes of patients are mostly 45 x and one sex chromosome is missing, which is caused by the non-separation or deletion of sex chromosomes during the maturation of sexual cells. This female patient has gonadal dysfunction, low performance, webbed neck, breast dysplasia, immature external genitalia, hairless or hairless pubic mound, accompanied by amenorrhea because there are no follicles in the ovary, and although she can have sexual intercourse, she is infertile. Women with hypothyroidism have no armpit hair and less pubic hair, and can have sex, but their sexual desire is obviously reduced. Simple gonadal hypoplasia is accompanied by alopecia, and fertility can be restored after treatment.