I had to tell my 17 year old boyfriend that when a girl has her period the blood actually comes OUT of her body. He was extremely grossed out! I still haven't figured out what he thought happened to it!
A childhood belief about periods

others believed things like this
- I used to believe period blood came from the nipples. I thought that was what "padded bras" were for!!Anon
- HA! I used to think when you got your period, you would just pee blood...I wish it was like that...if only.Anon
- I used to think that instead of bones and blood and tissue that you body was made up of tuna.— m.n
- when I was young, I heard that blood had iron in it. I thought blood was red because it was rusty.— Hunter
- My 3 year old little girl announced after spinning around for ages that she was 'feeing guilty' :-)— Adam
- I used to believe that guns shot out blood because everytime somebody shot a gun in a movie you saw blood.Anon