Radiolab asked listeners for their sex ed recommendations.
Ebony, a Radiolab listener, says, "My mother used it as my bedtime story one night in 1976 to inform me that I was going to be a big sister. As a little girl, I found the artwork a pleasure to view and I like it even more now. The writing does a beautiful, age appropriate job of explaining the differences between male and female bodies and reproduction (in its various forms) to children as young as three, while still managing to keep adults engaged. It was how I explained the differences between female and male bodies to my three year old son (now twenty years old) when he saw me getting out of the bathtub. He was wide eyed with shock and terribly concerned, asking "Mommy! Where's your penis!?" "How Babies Are Made" completely reassured him that his mother had not been mutilated, but, in fact, born that way."