Interesting thing is in most of these historical cases, there is a strong authoritarian push to stop these festivals to keep from corrupting people. This is the wheel of history coming around again.
"Even 20 years ago porn was too expensive for the average person to afford very much of it."
They could afford it, they could not afford to hoard and stream it at will. The mechanics have not changed significantly, even as we spend more time searching for "novel" mp3s and video.
Do we have a "problem" with Netflix? Pandora? I spend constant (wasted) hours cataloging and retagging my music collection.
I present to you, old Japanese porn: https://en.wikipedia.org/wiki/The_Dream_of_the_Fisherman%27s...
And here's a documentary about ancient Egyptian porn: https://www.youtube.com/watch?v=Q7HttHvJ8Gc
And here's a book about Mesopotamian porn: http://books.google.com.au/books/about/The_erotic_reliefs_of...
What I want to say is that porn is not only a staple of Western culture, it's a staple of humanity.