I think I've seen that MMO ad here and elsewhere, both with my home computer and work computer. But I wouldn't call it porn. Titillating, sure. But not over a line. I suspect it's just assuming it will catch the eyes of a majority-male gamer demographic. It apparently does.
For years I've been curious to experiment with clicking on some ads just to see what is actually at the other end. If I had the knowledge and/or resources, I'd set up a safe computer to do exactly that. Click those "interesting" links, (not just porn-like ones), and see what's actually to see.
Bullgrit