[BlessedOne04]

I believe that which is worse depends on intimacy and intent. If you are in a committed relationships there is a level of intimacy that is being broken with both an emotional sexual relationship. Having an affair is draining whether it is emotional or physical because in some way you are telling your partner that they are filling your needs and they may be lacking in some area. Even if your intent is not to say that, the other will have those thoughts at some point in the process.