I too am a former porn user and have some insights for you about your H. I have written on this subject before and learned a lot about myself in the process.
For you, you should realize several things. You can never compete with all the women on the web, who are willing to do anything he wants at the click of a mouse. And with no effort or strings attached. Second, he will likely take ever increasing risks and measures to hide this from you and maintain his steady stream of images. You have to understand as Ed alluded to his brain and eyes are working differently when under the influence of porn.
I too treated my W differently when I was doing porn and under its influence. I was shorter and more critical of her, she couldn't meet my expectations outside the bedroom let alone in. Eventually, I started to see this pattern of my behavior and its effect on W and the M. And I wanted to change it. For me it was way too late, she had already gotten into an A. D-Day for me triggered me to look at myself and not live that way anymore. Every aspect of my life went under the microscope and a complete overhaul has occurred.
For my W, the lying and coverup were the worst part and I became better at each of these because when she caught me one night and confronted me, she totally flipped out. I thought she would divorce me on the spot for her rage and tears. As a result, I tried to fight it on my own and told her what she wanted to hear. If you do talk to H about this, be loving and safe for him to reveal his own secret fears and struggles to you. Try to understand why he's doing it and may be you can help him overcome. For me, W was fairly prudish and not sexually adventurous, but I wanted to explore and express things that were by no means bizarre or aberrant.
What it comes down to is this...he has some reason for doing this that he can not fix on his own. You can help...God can do it in a heartbeat(as in my case), but he can't do it on his own.
Best wishes and good luck
ps. valuable websites for me have been the following:
http://www.contentwatch.com/community/archive_list.php, http://www.moralityinmedia.org/, and the book Every Man's Struggle(Battle)