jfancis, I think you hit on a key point when you mentioned the unspoken agreement. Traditionally, being in a serious relationship implies an agreement to be monogamous. Most people view sex outside of that relationship as cheating, unless it has been agreed upon previously, since their is the tradition of that implied agreement. I think that either there is no such implied agreement regarding the viewing of porn, or it is at least not as widely accepted. For this reason, it seems that if one partner has a problem with it it should be communicated and an agreement made. Otherwise, how can it be cheating if there is no agreement to break?
This brings me to another point. Can cheating exist without both parties having entered into an agreement? I suspect there are many situations where lack of communication has left one party believing there has been an agreement on a topic, while the other party feels that no such agreement was ever made. If the party who believes there is no agreement does something to go against what the other party believes was agreed upon, is it considered cheating?
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