ffwideopen: I've been pounded by a guy with 11" before (Gay guy here), but we'd been playing for quite a few hours and I was very, very well lubricated and very relaxed. I'd also been using poppers and we'd had some pot.
We were both interested in seeing how hard I could take it ... and how deep, so he had me on all fours and slid all the way in doggie style - Wow did that make me arch my back! He then grabbed my shoulders for leverage, and started thrusting in and out, gently at first but within 5 or so minutes he was really slamming it in. I thought it would hurt, because I could feel him poking against something deep, deep inside, but there was no pain at all.
Eventually i started cramping up after about ten minutes and literally pushed him out, but it proved to me just how much I could take when I was very horny and relaxed!
Next time I think I'd take more poppers