I thought a condom was made of hard plastic and shaped exactly like the penis, not soft or floppy like a deflated balloon. Consequently, I wondered, how do guys get them to fit exactly right?!
A childhood belief about condoms

others believed things like this
- I used to believe that gay guys had sex by sticking their penis in the other's penis.— Fanbrat
- I used to believe that a man's penis was carrot shaped.Anon
- I used to believe that the oddly-shaped clouds were made from oddly-shaped sheep— Dickson
- When I was 5, I thought cats were spawned from moss, since moss was so soft. Made sense to me.Anon
- I used to think that doctors added plastic to your face in plastic surgery.— caro
- I used to think that plastic surgery actually involved using plastic.
— JohnJ