Early childhood is a child aged 0-6 years, is a time when children can receive well everything given to children, including sexual education. At that age the child's curiosity is so great, children can ask about anything including sexuality problems. Teachers and parents are responsible for providing sex education to children. Therefore, the understanding of teachers and parents about child sex education must be mature, so that the introduction of sex education to children can be conveyed and understood well by children. Researchers analyzed the understanding of teachers, parents and children about sex education in RA 11 Siti Khodijah Batu City using observation, interview and documentation methods involving the head of RA 11 Siti Khodijah Batu City, 8 class A and class B teachers, 20 grade A and class B students and their parents. The result of the study is that the implementation of sex education in early childhood in RA 11 Siti Khodijah Batu City has not been applied optimally, so that children's understanding of sexuality is very lacking. The contributing factors are the low understanding of teachers and parents about sexuality, the level of education of parents, and the assumption that sex education in children is taboo.

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