My cousin (honest!) was told by a catholic priest when he was 11 that a woman had teeth inside her and that if he had sex with a woman that he wasn't married to then the teeth would bite the offending member off. I discovered this fact when I was 18 an he was 20 overe a pint, it took me a year to convince him it wasn't true !!! - he eventually lost his virginity when he was 21
A childhood belief about rude bits

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 believe that when you lost your teeth, all of them fell out at the same time.Anon
- I used to believe that eating burnt toast would make your teeth whiter and would brush your teeth for you.— Natasha
- I used to believe that if I didn't brush my teeth at night, ants would crawl into my mouth and eat my teeth.Anon
- Until I was about 8 I believed that your back teeth keep growing in until you have a full circle of teeth.Anon
- When I was very young, I assumed that false teeth were taken from dead people's teethAnon