The adult film industry has always pushed the envelope when it has come to many areas. Many experts say the adult film industry was a major force in the adoption of VCRs in the home. The same is also said in regards to DVD players and the proliferation of the internet, especially high-speed access to the internet.
It doesn't surprise me at all if the adult film industry also pushes the envelope in the way everyone views copyright law.
This Ain't Avatar is nothing new. While adult parodies have been around forever, the "This Ain't..." series has been around a long time as well. Other "This Ain't..." titles:
...The Brady Bunch
...I Dream of Jeannie
Well, you get the idea....tons more I didn't even mention.