Why is it that married men see their mistress as beautiful, y, incredible and amazing, while married women?

...see her as a s-l-u-t and/or a home-wrecking w-h-o-r-e?? How can people look at the same woman and yet have such contrasting perceptions of her? uming inside as well as outside of the bedroom the man knows her better than his wife does, could it be the wife's perceptions are tainted by jealously and rage?