While pornography is not new and has always played a pivotal and groundbreaking role in the development of advance technologies and means of communication, including that of book printing, the widespread access to pornography is a new thing that coincided with the widespread access to the Internet. If indeed there were some attenuated connection or causality between exposure to porn and searching outside of an existing relationship, we would see the figures of such searching skyrocket. Have you heard of such skyrocketing? I thought that morbid obesity has skyrocketed... so until I see a better argument, I will believe that too much exposure to porn has led to morbid obesity. Not that it is a really well proven connection, but at least it seems somewhat more rational than the connection between porn exposure and seeking outside the primary relationship.