1. sex education in infancy: education in this period needs to be realized through the upbringing and feeding of children by parents, mainly mothers. Physical contact between mother and child can increase the sensitivity of children's nervous system, which can also better promote the differentiation and development of baby's brain. This period generally does not exceed three years. It is good for children's growth that mothers and children sleep at the same time.

2. Early childhood sex education: Early childhood sex education is to let children know their gender, and it is also the time to instill basic sexual concepts, such as boys should love and respect girls.

3. Childhood sex education: Children's sex education begins at the age of 6 and lasts until 10. At this time, the child's sexual awareness is further enhanced, and he is unwilling to sit at the same table with the opposite sex and is proud of his gender. At this time, the psychological phenomenon of children should not be rudely intervened, but should be correctly affirmed.

4. Adolescent sex education: Adolescent sex education has special significance. At this time, the content of sex education should mainly be to let children pay attention to the matters of communication between men and women, how girls protect themselves, the preliminary principles of marriage ethics, and the clear basic requirements of legal and moral relations to prevent the occurrence of sexual crimes.

5. Adolescent sex education: Adolescent sex education is from 20 to 35 years old. Children are adults, have independent interests, and will gradually mature and start to fall in love and build their own small families. The main content of sex education is how to bear the responsibilities and obligations of the family, understand the life of husband and wife, understand the education of children, understand the family economy, and prepare for the establishment of a family.