Or maybe you need to be open and honest with your wife. I think to some extent most of us have things that we would like to be doing sexually that our wives or husbands will not respond to in one way or another.
Word. Don't cheat tho. If you're not happy tell her and don't be pissed off when you do. When she understands how you feel, she may be into trying new things she wouldn't have before.
I would probably say that your wife is equally frustrated. It's going to be really tough for both of you because you are so entrenched in your positions, however there is a way out. You need to start talking and flirting. If you had been a bit more open about what you are looking for, then maybe I could be a bit more specific, but if you have a suggestive and flirty conversation about something that you want to try, she will get the hint and respond one way of another. If it is the wrong response, then turn it into a joke. Talk dirty in bed, talk about a fantasy where she is the lead role, like playing with herself and being caught, or being with another woman, or her car breaking down and being rescued by a handsome stranger, and then being forcefully seduced, or whatever story she wants to play out in her mind. Don't just stick your dick in her, massage her, kiss her all over, smell her, taste her, give her some love and give her a running commentary of how great all these things that you are doing makes you feel, make her orgasm without expecting one yourself. If you open up some form of discussion you might start to see some change, however don't spring it on her. I would suggest telling her how you feel in a non confrontational way, and let her tell you how she is feeling, and then agree some next steps to getting things back on an even keel.