In law school I scrapped a planned paper on NAMBLA for just this reason.
Moving away from porn and into realms more esoteric, it used to be quite difficult to find web pages about TORG, my favorite role-playing game, because of the profusion of Sluggy Freelance links (Torg being the name of the main character). Indeed, you couldn’t even use the - operator (Torg -sluggy) because after a little while, all the TORG pages started putting up disambiguation notes clarifying that “this website is unrelated to the webcomic Sluggy Freelance.”
It’s gotten better now; there’s a resurgeance of material on the RPG in anticipation of a potential new release, and the comic, I’m told, has gone downhill. I wouldn’t know; I stopped reading in the vampire arc.