before i reached the age of 10 i used to believe erection is caused by being cold. this belief was well-founded on the fact, that i used to have erection while standing naked in front of big mirror in the bathroom after taking bath. i can't say i was somehow dissapointed when the truth turned out :)
A childhood belief about rude bits

others believed things like this
- when I was little, about 4th grade, I thought that when a guy had an erection his penis turned colors...lmao— peanut
- I used to believe whenever I got an erection it meant I had to pee.— Adam
- I used to believe that a homosexual is a man who doesn't have erection. — paatrik
- I used to believe that an erection was called a 'wallet'.Anon
- i used believe and erection was when your testicles went into your penisAnon
- I used to believe that an erection only occured after a male was married and that it was a permanent thing.Anon