I wanted to watch my wife, she said right after you suck a cock. Took a few years but we both enjoyed what we did.
You have to be honest with her,. Tell her you have sexual needs and you understand that they no fault of her own your needs are not being met. Reassure her you are not looking to run off but need her help in figuring out how to have your needs satisfied. Give her time to think about it and listen to her.