Author
Robie H. Harris
2 books here

It's not the stork!
Picture book · ages 4–8 · 500L · 2011
The gold standard for early-elementary sex ed—matter-of-fact, funny without being coy, and gives parents language they were probably never given themselves.

It's Perfectly Normal
Nonfiction · ages 10–15 · 780L · 2021
The most honest, shame-free guide to puberty and sexuality for this age—frank enough to actually answer the questions kids have, illustrated by Michael Emberley in a way that normalizes bodies without titillation.