I had a similar addiction in my late teens, early twenties. I had a massive collection of porn dvds, I bought magazines, I was phoning the premium rate numbers. I was constantly browsing the internet. I was always popping off to find more. I started getting bored with 'regular' porn and found myself looking at other types to get my fix. I didn't crave attention off anyone, I just wanted to watch videos of others having sex, in any form.

Luckily for me I managed to go 'cold turkey', threw away all dvds, mags etc, forced myself to stay off internet porn. Now I can watch it now and again without feeling compelled to it.
I hope your husband manages to help himself before he loses sight of what is truly important, you.