My younger brother believes a marriage with a wife who has your best interest at heart is a fantasy. I have to explain to him there are 100's of different types of women, each with different motives and their emotions are on different scales. SOme of them do want whats best for their partners and want to please them.
I had to tell him "maybe your looking in the wrong place".
The sex life you want is not fantasy, just have to find the right one OR your current wife needs to develop that interest level even if it is mostly for you.