Why do you even need porn in SK? You go out at night, put forth minimal effort and you can get laid. It's not difficult in Korea. Add curiosity because you are a foreigner, which makes cross cultural coitus and even less daunting hurdle.
Just don't double dip in the 된장 at the 포장마차 so to speak. (Neighborhood bike reference)
Hey, i can get laid pretty easy here, but sometimes i just want to watch some black guy rail a bunch of girls in the comfort of my computer chair.