In the United States, state education laws and regulations stipulate that before sex education is carried out in public schools, schools must have a formal written letter from parents telling them that parents have the right to decide whether to let their children participate, that is, schools can only carry out sex education courses after obtaining parents' consent.

Sex education in the United States is not unified. Generally, there are specialized courses, ranging from one week to two classes. Its teaching content also varies from state to state. Generally, sex education in primary schools is divided into two stages based on the syllabus of sex education issued by the American School Health Association. The first stage is the sex education for the third grade children in kindergarten primary school, and the second stage is the sex education for the fourth to sixth grade students. The emphasis of knowledge transfer in the two stages is different.

In the lower grades of primary school, the starting point of sex education is to love and protect children. In the upper grades of primary schools, special sex education classes will be held for boys and girls, taking various forms such as videos, pictures and teacher explanations.