I have no objection to parents using a picture book to teach children, even very young children, genital anatomy. But such a book MUST include cautions against showing your genitals to other people, and against asking about, much less asking to see or touch, other people's genitals. Children MUST know that if someone who is not your parents or a doctor asks to see their genitals, they must get away at once and report it to their parents (not teachers). That book, with it drawings of young kids nonchalantly displaying their junks, is not aimed at parents wanting to satisfy their children's curiosity, but at pedos planning to groom.