What's the use of a man having nipples?

In fact, it has little effect. Is caused by normal physiological development, that is, race. It has no practical function, but it can achieve species balance.

Both men and women have nipples, because there is no gender difference in early fetal development. At this time, the fetus shows female characteristics (or is similar to women) and secretes estrogen. It was not until six months later that the secretion of androgen led to the gender difference of the fetus, when the nipple had developed and formed. Men have nipples, but they are useless. However, their existence can at least give people a symmetrical aesthetic feeling.

The biggest factor that determines the difference between male and female characteristics is the different hormones secreted by them. Male androgens are dominant and female estrogens are dominant. Hormones, also known as hormones, are substances secreted by endocrine glands or endocrine cells. They directly enter the blood and are distributed all over the body. They affect the physiological activities of human body by regulating the metabolic activities of various tissues and cells. Androgen can promote protein synthesis and muscle development. Male hormones are dozens of times higher than female hormones, so male muscles will be very developed and strong.

Although men have no ability to have offspring, they also have some breast tissues because of nipples. Therefore, they also suffer from breast cancer. At the same time, if enough estrogen is ingested, men can grow breasts similar to those of women and can also secrete milk. Studies have found that long-term abuse of supplements will lead to the enlargement of boys' breasts.

However, in fact, whether male nipples are useful or not, men will have nipples. Until today, the nipple of a man has become an underdeveloped organ, because the nipple begins to appear in the third to fourth week of embryonic development, but the decisive gonad appears later in the fifth week. So both men and women will have nipples, and only after the fifth week will there be special differences between men and women.