Is P-o-r-n the same as Adultry?

I need some outside opinions. My wife denies an addiction to p-o-r-n but this has been an ongoing problem in our marriage for almost 20 years now. Of course she blames me….I am no longer attractive, I am a prude, I am not spontanious, blah, blah, blah,. I lost a lot of weight several years ago and got a makeover and the whole 9 yards and guess what! She still sneaks around to look at p-o-r-n while ignoring me! We only have sex about once every six weeks for about 10 minutes and I am fed up! I admit that after twenty years of this I am no longer even trying to look beautiful anymore. My self esteem is in the toilet. No matter how hard I try, I will never look like an airbrushed picture of an eighteen year old. And I resent being compaired to one.

I have never been married before and we have children. I have told her that we need marriage counseling and she refuses and says that all women look at p-o-r-n. I feel cheated on.