When I was young, I used to think that my clitoris was a small penis, and I was then always afraid to be caught naked because I knew that a female have a penis was...wrong, and I figured that I'd have to get surgery to remove it before it grew full-size. (I was always afraid of the prospect of having surgery.
A childhood belief about rude bits

others believed things like this
- I used to think that the penis was a sausage and that they could remove it and cook it.— L
- I used to think that Frankie Avalon sang, "Hey Penis, Oh, penis..." instead of "Hey Venus."Anon
- I used to think that babies were all born via surgery :(— Anonymous
- When I was little,
I thought women got pregnant through surgery.— Camille - I used to believe that gay sex involved a man sticking his penis inside another man's penis.Anon
- I used to believe that gay guys had sex by sticking their penis in the other's penis.— Fanbrat