This idiot above is exactly what I was talking about in my early post...tough guy calling people names cowering behind his keyboard, LOL. Anyway Admin, I found this and it is actually has more references to it than the reference that I was going to send you originally referring to "virtual" or "computer generated" porn:
http://en.wikipedia.org/wiki/United_States_v._Williams
I thought I would post this here so everyone could read it (although many like the dink above revel in being ignorant) rather than just emailing it to you. The actual decision that I was referring to dealt specifically & only with CG/3D porn. I can post that one to if you'd like. I hope this helps.