Well it's pretty idiotic...so part of me isn't surprised 
But then on the other hand you get GROWN ADULTS believing it - but I think they've, almost without exception - been brainwashed form an early age.
Do you have any sons at all btw? Or all daughters?
I myself have 2 brothers and 2 sisters in my family.
And I have no sons or daughters lol....it would be impossible for me to have had any even by accident lol.
I'm not infertile though (I assume lol).
EvF

But then on the other hand you get GROWN ADULTS believing it - but I think they've, almost without exception - been brainwashed form an early age.
Do you have any sons at all btw? Or all daughters?
I myself have 2 brothers and 2 sisters in my family.
And I have no sons or daughters lol....it would be impossible for me to have had any even by accident lol.
I'm not infertile though (I assume lol).
EvF