We had the Childcraft series of kiddie encyclopedias - volume 5, I believe, was all about the human body. There was a picture of a boy & girl showing their intestines, stomach, etc - but for some reason, the boy figure, turned slightly, only had a few loops of intestine drawn, I guess just to represent the space normally taken up by all the intestines. The girl, shown head-on, had the typical full set of intestines drawn. I believed that girls had more "guts" than boys and that's why most women had bigger stomachs and hips than men.
A childhood belief about general

others believed things like this
- Until the age of 10, I was terrified of peeing out my intestines.— darya
- i used to think that when you ate food it went into your heart not your intestinesAnon
- my parents used to tell me if you ate raw carrots,you would vomit your intestines.— gerald finkleton
- When I was a little girl, I believed that all cats were girls and all dogs were boys. :)— Mary Ellen
- That boys turned into women when they became adults and girls turned into men when they became adults. Anon
- When I was little, I believed that all cats were girls and all dogs were boys. Go figure!— Laurie W.