After I moved in with Mr P I stumbled across a dirty letter from when he was going out with his ex wife (I'm a liberal minded lady, but even my hair curled!) he was sitting with me at the time and I said something along the lines of ''what the hell are you doing keeping this?'' he answered that he didn't really know, but later on I kind of worked out that it was a bit of an ego boost for him as he was quite insecure...whilst to me it appeared that he still had a 'thing' for her.
In the early stages of our relationship (before we moved in together) we did talk about our previous experiences. I think both of us felt ok about it at the time, but nowadays it is never discussed ~ and I know for sure that we both regret talking about it.
Your fella sounds insecure..maybe he needs to hear some reassurance from you that he is desired, and that you find him sexy. Most (ok, all) guys like to hear that they have a massive todger! can't say much about the porn thing as it doesn't bother me when Mr P looks at it ~ I join in, in fact. However if it is taking over & replacing your sex life then you must have a chat. Maybe he thinks you have gone off it? if that's the case, correct him :o)