3 ~ 6 years old is a critical period for the occurrence and development of preschool children's gender consciousness. Sex education for children should be carried out in the following aspects:

(1) Gender identity and gender roles;

(2) scientific and concise sexual knowledge;

(3) Correctly handle the sex games of preschool children;

(4) Correct the bad habit of preschool children playing with genital and thigh friction.