To be serious about it for a moment (seriously, guys) the porn industry is facing piracy challenges of the sort that would give videogame executives nightmares. The content is widely available, even to people who don't know anything more than how to launch their browser, there's virtually nothing to differentiate it ("Scale Bustin' Babes 41" is a real title, by the way, and I doubt very much that anyone could convince me it's meaningfully different from Big Naturals 18) and almost none of us "need" a particular title or series anyway, and perhaps worst of all, there's no real interest in fighting to protect porn copyrights, because hey, it's porn. You may get indignant because people are ripping off the latest creative endeavour by Irrational or Bungie or Mojang, but how many people are really going to stand up and express outrage because the makers of "10 Man Cum Slam" aren't getting paid? Very few, I suspect.
(And yes, that is a real title too.)