The RIAA has been sniffing up the arse of a tonne of people who download illegal content over the past few years, with 100, 000 copyright infringement lawsuits in the USA in the past 12 months alone.
But now, the pornography industry are following in their footsteps by suing everybody in sight in order to scare people into no longer downloading their content. The Hurt Locker was last year's Oscar winning film about the Iraq war. The producers behind it complained that nearly nobody had seen the movie and that the result of this were illegal downloaders.
Yes, that's the reason.
Now the adult movie industry is wanting some quick revenue, why not sue people? Especially now that two of the biggest Adult BitTorrent sites were recently shut down, these lawsuits are just beginning. Most of them are within the $1000 range, with the RIAA using this method. Pay $X amount today or we'll own your ass faster than you'd blink.
They have lawyers in their pockets, most 'normal' citizens don't.