When I was a teenager my girlfriend corrected me, when I asked her about her libido, stating emphatically that girls don't have libidos. Years later we started dating again, and in fact are married to this day. All I can say is somewhere along the way she fortunately found that women certainly do have libidos.
A childhood belief about rude bits

others believed things like this
- I thought your loins were kidneys, and nobody corrected me until I was a teenagerAnon
- when i was young i believed that gay men got married to gay women!— robster
- I used to believe that women could only get pregnant once they were married and it just sort of happened Anon
- When I was younger I used to believe that women just magically got pregnant after getting married.Anon
- When I was 5 I thought that baby boys came from men and baby girls came from women...— Gaz
- When I saw signs stating "Lots for sale" I thought it meant that there was a lot for sale.— Robin