The urethra is so long that the viscous drag between the semen and the inner wall of the urethra has a much larger effect than in smaller penises, causing back-pressure and slowing down the semen.
Her name is Jana Kucova, she sometimes goes under a different name (try using this 'Kejsi' in other sites.) Not sure if she's done anything new in a while she might be retired from porn. And PDDH, the video you are refering to is on Xvideos and it's titled "Big Tit Girl Uses Big Tits as a Pussy" but yes, she is amazing.