My mom is filipino, and instead of saying "penis" we said the tagalog word for it (I don't know how to spell it, so I'm leaving that part out), and I never knew what a penis was until I was in fourth grade, when a kid at school hurt his testicles and said, "Ow, my penis!", and I asked my mom, because I'd never heard the word before.
A childhood belief about rude bits

others believed things like this
- i used believe and erection was when your testicles went into your penisAnon
- 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
- In first grade, I thought that if I've never heard of a word before, then it wasn't a word.— Destiny
- when I was little, about 4th grade, I thought that when a guy had an erection his penis turned colors...lmao— peanut