Traditional Chinese parents are always shy and tangled when they answer their children's question "Where do I come from?". With more and more attention being paid to sex education, the scale of sex education books is always concerned: what should be included in sex education books? What kind of sex education book is just right, and what kind of sex education book is too big? Let's compare and see what kind of children's sex education books in different countries are, what kind of books do you prefer, and what attitude do you have towards children's sex education?