Although this question was posted ages ago, I had to post an answer. (By the way, don't le Lennon fool you, I am female!) The myth that men are better if they're bigger, is mainly something that women say that men have become insecure about. Think about it - men analyse women on the size of their breasts, their bum, their thighs, their face, their hair, their clothes, their height, their weight - and although we can be just as critical, the one thing we can say back which we know is gonna hurt, is commenting on your size.