There is not reason to cheat, if you want to have sex with someone else leave your spouse. Don't keep them around incase something doesn't work out, that's selfish. Maybe he isn't fullfilling her needs and that's why won't have sex with him.
My husband is a laid off roughneck. When he was working he was gone for a week at a time. We were trying to give one of our dogs with a medical problem up for adoption, so I put an ad up on a classifieds website becaused he didn't want her going to the pound. They require you to give email so...