Chock this up to naivete, but I was just curious...

He does sound very depressed. It will take awhile to find the right medication or medications. Right now, you're both going to need a lot of patience while he works with his doctors.

I agree with Yoda. Maybe put less pressure on sex and more on comfort and love. I've heard that long, close hugs are a good place to start. With out an expectation for sex, he might feel more relaxed and actually more inclined to move in that direction.

But, in regards to the porn, is there any possibility he is watching it simply out of boredom? Looking for anything to change the monotony of depression? I have very little experience with porn; my fiance doesn't watch it (Truly! And this isn't just me being ignorant, we've discussed it quite a bit. He doesn't want to waste his money or risk getting viruses). But I'd be one to believe him if he says it's not doing anything for him. And maybe he has other reasons for clearing his history, or he's simply shy about it.