Because about half of my cat fight fantasies involve my wife losing to a female rival of her at work (a real woman), being beaten, stripped naked and completely humiliated in front of her male and female coworkers, I don't mention this fetish to her.
But she does know about a couple of my fetish interests, including my candaulism. And she plays along with my "needs", though if she had her way she would not when it comes to being nude in front of others. (A rule is they have to be strangers who live no where near where we live, so this is done a few hundred miles north of us at Laguna del Sol.)
But to know I imagine her totally nude before everyone she knows, some of whom hate her, and getting to see her be beaten in a fight with another woman, that fantasy I keep to myself.