I saw that graph before... I'm a C or something... I don't consider it as an egoboost. That graph came from an inquiry of 5000-ish women.
It's like when you do it with 2 C's to a women; they become nice and horny, like what is it then ???
Also: a petite girl won't give A's to an 8x6incher, she'll scream and run.... In my teens I took great care to date with women that could take it, I pity the 4-incher, but the petite might be happy. And I am happy i'm not longer then this; I would fuck less, as even now i'm hurting my wife when I get too excited...