I like the final theory, but given that most bulls never, ever get the chance to have intimate relations with a cow, I'm not sure they are bright enough to work out that the sperm that is extracted from them goes off to make children.
@andyp started
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I like the final theory, but given that most bulls never, ever get the chance to have intimate relations with a cow, I'm not sure they are bright enough to work out that the sperm that is extracted from them goes off to make children.