I was reading one of my Mum's magazines when I was about 7 and I read a bit about the clitoris.
I of course had no idea what it was at the time. It said that it was the only part of the human body solely there for pleasure and that stroking it brought LOTS of pleasure.
Because it also said it was located near the lips, I concluded that it must be the little dent above the mouth and used to sit stroking it, and was very disappointed when I didn't feel anything!
(PS, Sorry if this is a little too close to the line, there's no offence intended!)
A childhood belief about rude bits

others believed things like this
- I used to believe that a 'soul' was an organ of the human body, such as a kidney or lung. — Grace
- The very first time I saw a globe (of Earth, yes) I asked where "College" was located.— Shade
- When I was little I believed that when I put lipstick on my lips, the lips grew.— Alba Águila Castelló
- i use to bleave that a belly buttion was another mouth on my body and i will try to feed it— come on down and lets play tpir!
- i used to believe that tha if I had any body part stisking out of the bed it would get me— strait sleeper
- I used to believe that the babys born in the back part of your body and not in the reproductive system.Anon