The Greeks were an incredibly intelligent advanced people who relied on their own rigour to solve problems... they didn't even look to their gods for answers as much as seek answers for their Gods. The gods didn't really care and Greeks were left to fend for themselves intellectually. There were no straight answers to how and for what one should live his life. Thus, in the span of a few centuries, and after some borrowing from ancient Egypt and the near east, Greeks gave birth to a culture that's span and depth has never really been matched. Literature, art, science. And we've recovered only a fraction of material from that period. Who knows what the library of Alexandria held.
What I'm getting at here, is that a Greek dude would know that the size of his wang wouldn't make any difference to his analytical skills, but he would also know that a big fuck off wang up the arse would hurt.
If this simple fact has been cleaned up for modern texts, so be it.