text: Your wife has low self-esteem and keeps them as a moral booster when she needs them.  Demanding that she throw them out would only cause more friction.  But, to be warned, she does have a very high probability of cheating on you to make herself feel more complete.  You need to reassure her that she is a complete woman (to not only you, but herself) and that she is everything that she needs to be.  Moreover, she needs to come to the conclusion that those pictures need to go.  That part of her life is over and she needs to move on.  But that choice must be hers or it will come back in a vicious way.