i was at a dinner table with a bunch of my friends when i discovered that a friend of mine believed that 'bisexual' meant that you have both female and male parts. when i said uhm, no.... he went on to question about the rest of his theory, that he thought a bisexual person must therefore get pregnant constantly without having sex... he was dead serious. (i understand if this doesnt make the childhood beliefs list because, well, im talking about 20 year olds!!)
A childhood belief about sex

others believed things like this
- I thought "bisexual" meant hermaphrodite.— Madeline
- I used to think that to desex an animal meant to turn it from a male to a female or female to male.— Phil
- a male friend of mine used to think that only women who had been pregnant had periods— oiman
- I used to believe that a funeral organist was the person who collected the body parts of the deadAnon
- I believed that all cats were female and all dogs were male. — Biologically confused
- I believed that chickens pooped eggs (male and female)— WHAT-A-Doodle-WHO??