Women have a lot of vaginal secretions, so it seems natural to scrub the lower body. For thousands of years, women in China have developed a habit. Men rarely have the habit of washing their nakedness. In fact, men should always wash their nakedness. This habit should be formed from adolescence.
Male reproductive organs are divided into internal and external parts. The internal genitalia includes testis, vas deferens and accessory glands; Reproductive organs include scrotum and penis. These organs develop very slowly before puberty. After puberty, under the action of follicle stimulating hormone, luteinizing hormone and androgen, it begins to develop rapidly, much faster than other systems. Scrotum, a small wrinkled pocket, is formed by the skin of abdominal wall, and its color is darker than the surrounding skin. The scrotum is divided into left and right halves, which are connected in the middle. There is a testis and an epididymis on each side.
Scrotal skin is elastic, there are many wrinkles on the surface, it relaxes when the temperature is high, and sebaceous glands and sweat glands secrete vigorously, which accelerates heat dissipation; When the temperature is low, it contracts, reducing heat dissipation and moving closer to the body. This self-regulating function of scrotum is mainly to protect the spermatogenic function of testis. The penis is a male sex organ, with tintin at the front and abundant nerve fibers, which is the most sensitive part. After one year of testicular development, the penis began to grow bigger and thicker, and 17- 18 years old developed into an adult. A thin layer of skin wrapped around Tintin is called foreskin.
How do teenagers' genitals change?
At the beginning of adolescence, due to the rapid enlargement and thickening of the penis, the foreskin gradually retreated to reveal Tintin. If the foreskin is still wrapped in Tintin after puberty and needs to be turned over to expose it, it is called that the foreskin is too long; If it can't be turned out, it's called phimosis and needs surgery. Scales often accumulate in the foreskin. In adolescence, skin scales appear more frequently. Be sure to wash the foreskin upside down to avoid inflammation of Tintin and foreskin. Testis is the most important part of male genitalia, and it is a pair of oval glands. The testicular volume before puberty is only larger than that in infancy, less than 3ml. After puberty, the testis develops rapidly and its volume can reach 12ml or more. The length and bending degree of the internal convoluted tubule increase and the lumen becomes thicker. Spermatogonial cells on the basement membrane of tubule wall continue to divide and reproduce, and spermatogenic cells appear at various stages, and eventually develop into sperm. Testicles also secrete male hormones, so testicles are both reproductive organs and endocrine organs.
During the fetal period, the testis is in the abdominal cavity and descends into the scrotum after birth. Some boys have no testicles in their scrotum or only one side. This is because the testis is still in the abdominal cavity, which is medically called "cryptorchidism". They should go to the hospital for examination and treatment as soon as possible. The accessory glands of male reproductive organs include seminal vesicle, prostate and urethral glands. After puberty, all the above glands develop rapidly and secrete liquid, which is mixed with sperm to form viscous milky semen. Nocturnal emission is a unique physiological phenomenon of men and an important symbol of adolescent development. After puberty, it will happen to healthy men.
The average age of first nocturnal emission is 14~ 16 years old, which is about 2 years later than the average age of menarche in girls. The first nocturnal emission mostly occurs in summer. There may be no mature sperm in the initial semen. After the first nocturnal emission, the body development gradually slows down, while the testis, epididymis and penis develop rapidly, approaching the adult level. With the development of reproductive organs in adolescence, secondary sexual characteristics such as hair growth, voice change and Adam's apple appear. Hair appears first, followed by armpit hair. A year after armpit hair appeared, the beard grew out. Protrusion of Adam's apple is a unique secondary sexual characteristic of men.
Why do boys get into the habit of washing their nakedness frequently?
As mentioned earlier, scrotum and penis have many wrinkles, many sweat glands, many secretions and poor ventilation. Wearing chemical fiber underwear and tights will make ventilation worse, so a lot of sweat, dirt, residual urine, unwashed feces and semen will pollute the whole penis, scrotum and perineum, and bacteria can easily grow and reproduce in this environment. If it is not cleaned in time, it will not only stink, but also be unfavorable. If you have sexual intercourse under the condition that the male's lower body is unclean, it will also bring these unclean dirt and secretions, bacteria and microorganisms into the female vulva and vagina, which will affect the cleanliness of the female vulva and vagina and even cause diseases such as vulvitis, vaginitis and cervicitis.
Therefore, men should also develop the good habit of washing the lower body with warm water before going to bed. Don't wash your lower body too hot. You should wash your reproductive organs first, and then your anus. After washing the anus, you can't wash the reproductive organs with the same basin. Wipe the reproductive organs first, then wipe the anus, and the order is dry. If you wipe your anus, don't wipe your genitals with the same towel. In order to save trouble, some people want to clean their lower bodies by washing their feet, but they don't know that the mold of beriberi will be brought to the perineum, which is easy to cause tinea cruris. You can't wipe your feet by wiping your lower body with a towel You should prepare a separate towel to wipe your lower body. After wiping, wash it with clear water and dry it for later use.