When I was around 9, a boy about a year older than I was told me a rubber was a thing a boy puts on the end of his prick so the girl doesn't get pregnant. I pictured a cork-like stopper made of hard rubber.
A childhood belief about condoms

others believed things like this
- My dad told me that the reason Birds didn't get electrocuted on overhead wire was they had rubber feet!!— Derricki
- I had an 18 lb. cat who ate rubber bands, I used to believe she could bounce away if not careful.— Dawn
- i used to think that condoms were rubber circles and i never knew how they stayed on— hello
- I used to believe that your brain was a red rubber ball inside your head.— Greg
- I used to believe that if I swallow chewing gum, a rubber tree will grow on my head!— Farry Aprianto
- I used to believe tampons go in but they never came out and I aslo belived that condoms were rubber underwear— Elise