I submit, for your consideration, exhibit A in the case of needing accurate age-appropriate education about our bodies, a scene from the PreK classroom where I work:
We are reading a book about how dinosaurs say good night. One of the dinosaurs turns off the light with his tail.
Lead teacher: Do you turn off the light with your tail?
All kids: No!
Boy: We don't have tails! We have butts and penises!
Girl: Girls don't have a penis! We have cookies!
There's a split second where everyone looks at the boy, then the girl, thinking we're going to tell them not to say "penis." My lead teacher says, "Girls have vaginas," and keeps reading.
At least the girl didn't call it a vah-jay-jay.