Originally Posted by ifxne_at_yahoo
My theory is opposites attract. It's an evolutionary thing I'm guessing. If a girl has brothers with large penises she's naturally attracted to small penises whether she realizes it or not. if she was attracted to large penises she would be attracted to her brothers and evolutionarily that is not good. Now you get my logic and know it has served me well.
You started off on the right track, then went in the way wrong direction.
There are factors in opposites attracting, but i think the last part the body focuses on when it comes to evolution is penis size. Or at least, it's less significant. Opposite immunities, opposite health resistances, opposite strengths are probably a better focus, and not because they are opposites, but because if, lets say, a women had a genentically lower chance to get cancer, and she met a guy who had a lower chance to get diabetes, that raises the chances that their children will have a lower chance for to get either.
That's like the test they did, where people with different immunity resistances from each other smelled less like BO to each other.
Height, though, could be a factor, because taller usually equals stronger, therefore, taller, stronger kids.