My 9-year-old has expressed a desire to know what a vagina looks like. He has awareness about eggs being fertilised by sperm, and that sperm is made in the testicles (they have a special book on that in the children's section in the Barbican library). We have talked in an frank and unembarassed, but gentle, way about loving relationships and "special cuddling", and that babies come out of vaginas. So I would like to know if there is a book out there anywhere, suitable for a 9 year old, not with photographs, but with illustrations showing the human sex organs in clear detail. He is very sensible and scientifically-minded and I do not want to make the subject of vaginas taboo for him. Thanks for any book ideas.