Tactiley (no, not tactically) speaking, it is a very different experience plugging away at a woman with a physique like Serena's as opposed to your typical woman. I dare say it feels significantly better, hence my finally understanding the allure of the bigmikecox thread: these fellows are associating certain phenomenological content with the pics that you just won't have onboard until you've had some for yourself.
Don't tell them that. Let them keeping plugging away at assless wonders believing they're getting grade A ass.