Different ways and means should be adopted according to the age of the child. Your question doesn't specify the age of the child, so I can only answer it in the following form.

1? If the child is under four or five years old (including four or five years old), you can combine our introduction and use pictures, videos and pictures for sex education. For example, find a cartoon with boys and girls, for example, find a card with boys and girls, and take the opportunity to tell him the difference between boys and girls (body organs, living habits and clothes). Also tell him (her) which parts of his (her) body can't be exposed to others and can't be touched by others (the parts covered by small vest shorts). If someone touches you, you must tell your parents when you get home.

2? If the child is between 6 and 8 years old, it is necessary to combine some books and pictures to explain to him or her the process of conception and formation of the embryo, the approximate size of the fetus in June, when it will move and when it will have small hands. When can you hear the sound and so on. Or you can take the opportunity to tell an interesting story that he (she) was in his mother's stomach when he (she) was a child. You can tell your child the form of delivery, and you can also tell him or her the differences and characteristics of three-month, one-year-old and two-year-old babies.

3? If the child is between 9~ 12 years old, the boy tells him about the formation of Adam's apple and the growth of pubic hair, and the girl tells her about menstruation and how to deal with it.

4? If the child is about 12- 14 years old, tell the child how to protect himself as much as possible when he is in danger.

5? If the child is 15- 18 years old, tell him/her that sexual intercourse is not shameful, but it should not happen at his/her age, because he/she is immature, and if he/she has sexual intercourse, it may hurt the body. However, if you encounter unusual situations, such as how to protect yourself when you are raped by a bad person or sexually induced, you must take a condom as a safety measure, or you can take the form of taking birth control pills afterwards. Tell mom and dad truthfully when the children come back.