When I was 10 I thought Sperm came from your urine. A friend and I both believed this to be true. Then one night he called me and said "I've got sperm! I'm a man now" I asked what he meant...and he told me that he had urinated and saw them swimming around in the toilet. So for the next few days I bent down to closely inspect the toilet for little swimmers after I urinated. Sadly I never saw any...My frustration caused me to finally ask my dad about it. He simply laughed and said "Sperm doesn't come from your pee" without any further explanation.
I figured it out eventually...
A childhood belief about weeing and pooing

others believed things like this
- I used to think that women urinated out of their buttholesAnon
- I used to believe that monsters lived in my toilet and they ate my poop and urine when i flushed the toilet.Anon
- I thought that toilet paper was bread and by puting it it the toilet i was feeding the ducks at the bottem.— Gringo
- I used to believe that if I flushed the toilet before I showered, I would take a shower in dirty toilet water.— Chris D
- I used to beleve when i was 4 that the flush on the toilet was to wake up toilet monsters.— Millie
- I used to think if I left the toilet seat open my cat would get flushed down the toilet.— G