If that was really your wife, I could understand why you are so depressed about her never giving it up. I'd hold her down and fuck her whether she liked it or not.
Here's my advice, after you get divorced, find an ugly and/or fat girl who cooks, cleans, does laundry and knows when to shut the fuck up. If it is a given that all married women stop giving it up, then at least this way you won't be so depressed since you don't want to fuck her anyway.