Tactiley speaking, it is a rather 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 gotten some for yourself. (Not that there still aren't too many obese whales posted in that thread, however.)
