Men with more body hair, giving people an extremely male tough feeling. Compared to the fine flesh of the white-faced students, with this feature of the man for many women favored. The reason for this, there are only two: one is because men with more body hair, natural form tough, can bring women more sense of security; one is because of rumors that men with more body hair, sexual ability is strong, strong libido. The truth is really so, or some men and women wishful thinking? The main influence of body hair and male hormones and male physiological function is most closely related to the testicles, because the testicles can produce androgens. The male testes produce androgens, which determine male physiological functions throughout life, from gender differentiation during embryonic life to secondary sexual characteristics changes during puberty, from maintenance of sexual function to fertility, etc. In addition, we need to note that hair at different locations on the male body surface does not coincide with androgen levels. The most typical example is our hair. Men with high androgens are significantly more likely to lose their hair than those with low hormone levels. As a result, researchers have invented anti-androgen drugs to treat male hair loss. This is related to the expression of androgen receptors in different parts of the body, and scientists are still working on the mechanisms involved. It just goes to show how amazing the human body is. Androgens are the biological basis of male libido and sexual function, and can indeed be reflected to some extent by physical characteristics. We commonly see patients with hypogonadism who have abnormal body surface. For example, some young patients have not grown a beard after puberty, or only need to shave once a week, their voices are still clear and childlike, and they have very little body hair; but on the contrary, their fathers, male relatives and friends in the family have normal body hair. There are also some men who have passed puberty and have not developed their genitals or grown pubic hair. These symptoms often suggest that we may have hypogonadism and need to go to the hospital. From a physiological point of view, secondary sexual characteristics can reflect, on some levels, a certain level of sexual strength in men. Body hair is mainly influenced by androgens, i.e. high androgen levels and relatively more body hair. However, we cannot ignore the role of genetics. For example, many European and American men have more body hair, obviously than yellow men, but their sexual ability is not necessarily stronger.