Our babysitter told my brother that he would go blind if he touched his own penis. I distictly remember him (he was 6, I was 4) asking if he could only touch it enough to need glasses instead of going blind.
A childhood belief about rude bits

others believed things like this
- I used to believe that people who wore glasses were blind and could only see when they had their glasses on. Anon
- I used to believe that if you were blind you could wear glasses and you'd be able to see again— Jane
- my sister used to believe that glasses were for blind people.— Lauren
- I used to believe that blind dates were dates for people who were blind.Anon
- I was told that if you went to brd with your sox on you would go blind.— Frank L
- That masturbation would make you blind— NN