It's rather dishonets to link internet porn as the causal facotor for affairs. Obviously people had affairs before the internet and do so in the absence of the internet.
They might as well have linked obesity to internet porn.
I have a friend whose husband first got into internet porn. Then he met someone online in a porn site. Now, he's asked my friend for a divorce.
I think internet porn is very addictive, and it just makes it easier to find someone else who is also into the same thing.
My poor friend had to be tested for STDs, and she has 2 small kids. I feel very sorry for her.