sex therapy and couples retreat are great ideas, and i would try them in a heartbeat, but she would only see it as me trying to get more sex out of her.
therapy has been tried, but once she became the "target," she quickly refused to go anymore.
therapy was all about me--about my "poor" parenting skills as not being a team player, that i always go against her better judgement, that i'm the nice guy and make her the bad guy--and the philosophy was that if i can become a teamplayer, then her libido would come back, because she would feel as if we were on the same team. i agreed adnd said that i would change and have been doing my best to be a teamplayer, and still she has no attraction towrds me.
once therapy switched to her issues she tried to deny her problems and decided that there was nothing wrong with her and didn't want to go anymore. for example: being unable to say that she loves me whenever i say it to her because she feels that if she says it all of the time it becomes trite and meaningless.