When I was young I thought your periods started when you had sex, and I also thought no one had sex before getting married.
I used to shudder as I imagined myself buying my first box of tampons after my honeymoon and wondered why women wanted sex at all if their periods started after!
A childhood belief about periods

others believed things like this
- i used to believe that women wore bras because their periods happened in their boobies.Anon
- a male friend of mine used to think that only women who had been pregnant had periods— oiman
- i used to believe when iwas young that during periods, one bleeds through thier breastsAnon
- I also used to think that Mommies didn't have periods. I thought it went away once you had a baby.— T
- i thought the phrase "getting a boner" referred to men getting their periods. — astrid
- When my mom was a child, she thought that while girls had periods, boys had hemorrhoids!Anon