Depends on how many demons per porno you get. 10 to - is about right if it takes an entire aged cardboard box, but if each individual magazine or video file can summon it's own demon, hell would have actually run out of demon a long time ago.
I am reminded of that chick tract where the doctor finds out this guy has been raping his young daughter and the doctor's response isn't to call the police but to advise the man to stop watching pornography.
http://jackchick.wordpress.com/2011/04/01/chick-tract-review-lisa/ It's important to note that if you've read his other works the first thing that sticks out is how many apparently valid excuses this guy has. The economy is bad, he's unemployed, his wife seems to put food on the table just to spite him. Jack Chick *never* adds mitigating factors to his stories unless he's attacking those factors directly. This is the most understanding and empathetic portrayal of a character he has ever done.
I hate haunted porn. I used to put my tissues and hand cream in my dresser and when I turned around they'd be right back on my nightstand. Fucking ghosts.
I once found haunted porn too. I had just got done doing some urban exploration of an abandoned summer camp and then decided to stop at a creepy looking abandoned house on the way back with a barn full of junk. It was apparent some kind of creepy drifter was living there at the time. I found a box full of bondage porn. "Tales from the Whip" "Sorority Hellhouse" and "Kidnapped!" are all titles that I remember vividly. I stole the box and had plans for distributing pages in people's mailboxes but a burned out hippy stole the box from a friend's house. I like to imagine he's haunted now.