I used to think that only girls got their temperatures taken rectally because girls (ie, moms) were allowed to see other girls' tushies but not boys' tushies. I was the youngest of three girls and their were no boys in the house. One time, I saw my friend's brother with a thermometer on top of a jar of vaseline in his room when he was sick, and she told me that both boys and girls got their temperatures taken in their tushies.
A childhood belief about being ill

others believed things like this
- I thought that the difference between girls and boys was that girls have teeth.
Anon - I used to believe that little boys grew up to be girls and little girls grew up to be boys. — Darin
- when I was a kid, I used to believe that only girls could be my friends and all other boys were my brothers.
— rajat - I used to believe that tigers were girls and lions were boys— Ruth
- I used to believe that all cats were girls and all dogs were boys.— jordan
- I used to think that all cats were girls and all dogs were boys. — trav