This kinda reminds me of an argument I had with a friend of mine once, years ago before I'd ever though of keeping chickens. He told me that as male birds didn't have proper penises, birds didn't ever have sex and that all female birds always laid unfertilised eggs, which the male birds then squatted over and kinda dropped their semen onto. He said that as shells were porous, it soaked through and fertilised the females' eggs that way.
He was deadly serious about this, and wouldn't change his mind even after I explained cloacas etc in great detail to him. He actually laughed at my explanation as he thought I was having a joke at his expense. And he was in all other aspects what I'd have called an intelligent guy.