I used to think that girls had "balls" and not boys, and the "balls" were slang for breasts
A childhood belief about rude bits

others believed things like this
- I originally thought "balls" was slang for buttocks instead of testicles.Anon
- i always thought it was Grape Balls of Fire instead of Great Balls of Fire— Courtney
- i use to believe guys could have a random # of balls but the maximum was 4— bookie
- I used to believe that the clouds were made of cotton balls— Jeannie
- i used to beleive cotton balls were marshmellows— carly
- I also thought that meat balls were made from testicals— Glenn