My wife and I are similar. We both have some active fantasy life. She has fantasies about her being with other women, from time to time is turned on by male on male gay porn, as well as my femme self being taken by a man in front of her.
I certainly have fantasized about men getting it with my femme self but never as male. But the thing is we would never act on it, well never say never but I think we both figure the fantasy is probably better than the real thing. My conscience would not allow me to step outside of my vows, the guilt alone would eat me alive.