At age ten, my son still likes me to read him a book before bedtime. We mostly have little kid books since I sort of stopped buying picture books for him.
Anyway, I grabbed a book with a name something like “Amazing You”. It is about body parts. It shows sperm and so forth. Anyway, that provoked a good discussion. He wondered when he would get sperm and I told him about age twelve.

I need to get him a body book for his age……… Something to consider.