Sexual education literature is often blasted for being too vague or too clinical for kids to understand, which is exactly how those who don't want sex ed taught in schools like their literature.
But there's no place for vagueness in sex ed, and even this beautifull illustrated book from 1968 called How Babies Are Made explained sex better than many modern sex ed textbooks.
It does, however, omit a visual reference of the sex act itself, which is forgivable considering when the book was published, but overall Time Life did a bang up job of creating a kid's sex ed primer.
How Babies Are Made is full of beautiful papercut illustrations by Blake Hampton, easy to understand descriptions of sex acts, and connects everything sexual to the process of fertilization. Maybe it's time for this book to be reprinted?