What are the main developments of male secondary sexual characteristics?

After boys enter puberty, since the human body will metabolize a lot of androgens, the growth and development of secondary sexual characteristics will follow. Men need to have a certain understanding of the growth and development characteristics of their secondary sexual characteristics. So what are the growth and development characteristics of secondary sexual characteristics in men?

(1) The formation of hair (beard, armpit hair, pubic hair), especially the growth of pubic hair on the penis, can be regarded as the beginning of male estrus. Generally, male pubic hair begins to appear at around 12 to 13 years old, with a small amount of light-colored and fine hair on both sides of the penis. Then it gradually spreads to the vulva, the color gradually darkens, and the hair becomes thick and curly. In late adolescence, pubic hair also appears at the base of the thighs, pubic symphysis, and anus. Armpit hair appears about a year later than pubic hair, and generally starts from the center of the armpit and spreads to the periphery. The beard sprouts at around 15 years old, starting from both sides of the upper lip and gradually growing towards the center, and then it also appears on the temples and jaw. Some people's beards will grow to a certain extent and become sideburns. The beard on the chin will not grow until the boy's reproductive organs grow and develop.

(2) Voice changes. The sound changes from sharp to thicker. The larynx in the middle of the neck becomes prominent. Generally speaking, the length of the buried vocal cords of children is 9-1b250m. After entering puberty, the thyroid cartilage of the larynx also changes significantly, so the larynx becomes more and more prominent. The vocal cords also lengthen to about 13-14mm. The voice changes later, around the age of 14. The growth of the larynx only accelerates after the rapid growth of the stem stops.

(3) The male testicles and penis become larger. Under the influence of male hormones, the male reproductive organs grow and develop significantly. As the male testicles mature, they will continue to metabolize sperm, resulting in frequent nocturnal emission.

The secondary sexual characteristics of boys appear. Characteristics of human growth and development: the height has just begun to increase significantly, the male testicles and male genitals have just begun to grow, and the Adam's knot has appeared. The voice has changed, male pubic hair and armpit hair have appeared, and the height has increased significantly. Frequent spermatorrhea for the first time, beard has appeared, and the male genitals and male testicles are close to those of adults. The sweat hair is close to that of adults. The epiphyseal line has just begun to heal, and the body is sturdy, the shoulders are broad, and the skin is not smooth.