When I was about 12, I believed that boys had periods too. I read in a Child
Craft book about boys and masturbation.
I thought that girls periods was called Menstruation; and they called what the boys had masturbation.
I told all my friends this. I was so embarrassed
A childhood belief about periods

others believed things like this
- When my mom was a child, she thought that while girls had periods, boys had hemorrhoids!Anon
- I never knew why boys had to lift up the toilet seat...until my friend told me that boys had bad aim.Anon
- 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 the Beastie Boys were a boy band. Well, the name sounds similar to Backstreet Boys!Anon
- When I was a little girl, I believed that all cats were girls and all dogs were boys. :)— Mary Ellen
- When I was little, I believed that all cats were girls and all dogs were boys. Go figure!— Laurie W.