I used to believe that when babies where born they all had penises and if the parents wanted it to be a girl the would push the penis in and when the baby got older breasts grew because the penis took up to much room.
A childhood belief about rude bits

others believed things like this
- a friend of my little sister's had 4 older brothers, so she thought that when you got older you grew a penis!Anon
- I believed that women who wanted babies ate a seed, which then grew into their baby. — World's Worst Scientist
- I used to think that Frankie Avalon sang, "Hey Penis, Oh, penis..." instead of "Hey Venus."Anon
- 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
- im a girl and i used to think my mom had a penis and i would eventually grow my ownAnon