It's a simple thing but I have always enjoyed showing pictured of my wife to certain male friends. She knows but doesn't know which ones, when or how often. The humiliation of being exposed.

My favourite is guy who lives almost opposite and also married. I show him pics all the time so he has a perfect idea of what her tit's and pussy look like. It's great when he's talking to her because I know this and she has no idea it's him that has seen her. Probably the one she least expects and he's a porn addict