My main argument was not so much about symmetry, but what a woman thinks is “big.” While somebody with a lot of length obviously looks very long, I think the girth is what most women feel/focus on/enjoy, etc.
A fat cock probably feels bigger than a long thin one. And if your press a woman to put a number on that fat cock, she might distort the length remembering how it felt.
A guy could have very respectable length - say 7.5” - but if his girth is less than 5 inches, he probably won’t leave much of an impression on her - at least not in her categorization of “small-medium-large.”
But another guy might be less than 7” long, but if his girth is 6” or more, she will definitely conclude he had a “big dick.” Even though he wasnt’ going in as far as the longer guy, he probably required more “care” to work into a groove - and she would’ve felt it so much more. With the 7.5 x 4.8, especially if she was very wet, he would’ve easily “slid in and out” of her with minimal resistance.
So, if she were thinking back on those two lovers, she would’ve actually regarded the thicker 6.8 as bigger than the thinner 7.5 - and, volumetrically, she would’ve been right.
Of course, the Big Dick Jackpot is both a lot of length & a lot of girth.