I used to believe that when a woman got period for the first time she wasn't virgin any more.
A childhood belief about periods

others believed things like this
- My sister just recently realized that the lyric "more than a woman" wasn't 4 letter woman!— Anne
- i used to think a virgin was a type of nun because of the 'Virgin Mary' being religous!!!Anon
- I was horrified when my first period arrived. It wasn't blue, like in the commercials for sanitary towels.— Jane
- I thought that your period came out all at once and you had to wear a pad around the time it would come.— Sarah
- I used to believe that if you left crumbs out for a long period of time, they would turn into ants.— Bylaberrie
- That you had to marry your sibling. During this period of time I devoliped a crush on my brother.— don't worry I'm a girl