re hborre's comment re copyrights, I might disagree. Cosmetic touches might make the image a derivative works, or it might not depending on what exactly one changed. But, having read all these comments I want to relay what a speaker at a WSBA CLE I attended back in the early 90's said: erotica has driven technology. That was true then, it is true today, ever since the Super 8 movies to today's version of digital information. Back in the day, no one believed these college kids stayed up al night trying to find a faster way to send their mother's cookies recopies to their friends. There is no reason to assume anything has changed today. No one needs to like or support erotica, but everyone must realize how it's influenced the technology we use. 

As always, just my contribution to the marketplace of ideas.