I can think of two of my acquaintances who think it's cheating if their husbands look at porn magazines. A lot of the wives of the guys who work with my husband think that going to a strip club is cheating (just by looking, not getting a lap dance or anything else). Personally, I think they're crazy. But it just goes to show that every relationship, and the boundaries people are comfortable with, are going to be different. It's not a one-size-fits-all kind of thing.