Women really don't learn a lot about their genitalia because it's pretty hard to see. And some women like me weren't even taught that masturbating was a thing. I had to learn it from my internet friends. So I didn't have any practical experience with mine for a while, and it's kind of hard to see it without a mirror and posing really weird. I was a sheltered moral Mormon, so I wasn't going to look at real pictures of a vagina.
As for penis, well yeah that should have been obvious from looking at anatomy pictures in health class.
Anyway that sure escalated quickly. It is really sad how women are expected to keep their libido in check, but men aren't. It's just as bad for women sometimes.