There is this notion that when it comes to size, all that matter is the penis. I think this is due to the fact that the penis protrudes outward from the body. It's universally open for comparison, put down, ridicule, you name it. Is it fair? As one who has experienced the size issue in gut wrenching fashion both provoked and unprovoked I have come up with a sure fire way to end it once and for all. Now it might take a few years to circulate the globe and take full affect, but it will work.
Since it seems most all of us averaged sized, to maybe slight above average size, to maybe under have all faced the gleeful woman sharing her unbelieved experience with Mr. Huge, this is how you handle it.
1. Do not get angry, let her talk. Let her face light up with awe and happiness as she describes her huge ex and how amazing it was for her. Agree with her, tell her how it must have been amazing and all. Let her go on and on...
2. when she is completely done and had her fill of indrectly ripping your manhood apart, probably for simply being normal sized and within the same sized that 90% of men fall....5-7 inches..... place your arms back over your head and smile big and real, have a look off total glee and recollection on your face and tell her about the girl you had who was so tight. Describe in great detail how long it took you to work in a single finger and how it gripped your finger so tight and how your thoughts shifted to "oh God, when my cock slides into this tight vagina, it will be overwhelming....Go on and on just like she did...Then finish it up by telling her how study after study has proven that women's sizes vary by 40% more then men's even do. Tell her how nice a fit and tight vagina is cause you can feel every wall, side to side, top to bottom and be sure to describe why that sensation MAKES A DIFFERENCE. Do it tastefully and with the same regard, or lack there of, that she told you.
If she lacks the capacity, to grasp that in general, big pussies, like or need big cocks and that size is not just all about men, it's every bit as much about women, then dump her.
Men and their penis sizes have been attacked for far too long. Average is considered small anymore, even though it's what 90% of us have, because today's women have recycled the top 5% of cocks that get around more. That's fine, but to consider us lacking, or small because they scored a few huge dicks, is just wrong....
Again, don't throw it back in their face in a rude way, just handle it in reverse with the same consideration she showed you.
I listened to my last girlfriend go on and on about a few giant ones she had and the SECOND I started telling her about this super tight, responsive pussy I once had (there have been many really) she shut me down and started crying......problem solved.
Sometimes, showing someone by EXAMPLE, is the only way to get it done.