Flutterby™! : explicit physiology education

I once heard Carol Queen assert that much of the "common knowledge" of the physiology of sexual organs in the human female is messed up by the selection bias of cadavers that get dissected: Intact corpses tend to come from old people, and that impacts how we learn about internal physiology.

For a look at some of what's been learned about that, Betty Dodson sketches the internal structures of the clitoris (Via Susie Bright), and, if you're up for something more explicit, this YouPorn video of a masturbating woman's vulva has some amazing opening up and lubrication in quantities that only a few years ago were commonly thought to come from urine.