Parents should educate their children that the structure of human reproductive system is different between men and women, which is a normal physiological phenomenon and there is no mystery; People's sexual function will not mature until adolescence, just like everything is growing in an orderly way, which is not surprising or irritating. Parents should explain the structure and sexual function of the human reproductive system to their children and tell them what "menstruation" and "nocturnal emission" are. Menstruation is the periodic bleeding of female endometrium under the action of estrogen secreted by ovaries. When a girl reaches puberty, her ovaries mature. Every month, an egg is discharged from her ovary and reaches the uterine cavity through the fallopian tube. If she doesn't meet sperm, she will die in a few days, the endometrium will fall off, the blood vessels will rupture and blood will flow out of her vagina. This is the basic process of menstruation. The menstrual cycle is generally 28 to 35 days, and the menstrual period is generally 3 to 6 days. The amount of bleeding each time is 50 ~ 100 ml, and the blood color is crimson. The first time a girl menstruates is called menarche. The menstrual period is not necessarily regular in the first year or so. It is normal that the interval between menstrual periods is 2 ~ 3 months or more than 10 day, and then the menstrual period tends to be stable.

After the boy enters adolescence, the secretory function of testis becomes stronger and stronger, and mature sperm will be produced continuously. When the sexual organs encounter external stimuli, especially sexual stimuli, they will automatically emit semen, which is nocturnal emission. Nocturnal emission often appears with dreams at night, so it is also called "wet dream". It is normal for boys to have nocturnal emission 2 ~ 3 times a month. Parents should educate their children about sex physiology with a serious and scientific attitude. Parents should tell their children about this knowledge according to their sex, that is, mothers tell their daughters and fathers tell their boys, so as to make it clear.