I used to believe the number of kids people had was the number of times they've had sex
A childhood belief about reproduction

others believed things like this
- when i was little i believed that your social security number was the number you were born on the earth — christine
- I used to believe there was a number "eleventeen". I could never quite work out where it went, though.— Matthew
- I used to think boys went "number two" with their pee pees. Anon
- I used to believe that twenty was the largest number in the universe.— Bernardo Fernandez
- I used to think that any number with a decimal point in it was HUGE.— sm
- When I was a kid I believed that the number 11 was pronounced "onety-one"— Alicia