This may be just me and not all women but if as your wife I was behaving as she does I would be wanting to see some anger some jealousy some sign that I belonged to you,that you wanted me and in no way shape or form would you put up with sharing.
To me she is screaming out for you to show some passion and I don't just mean in the bedroom. She feels neglected,uncared for and unloved. Granted she could say all this verbally but maybe she feels driven to express that in other ways because for years she has been or thinks she has been telling you this.
BINGO!
I have been reading your posts for a few years now and it really does seem like you need to do something drastic. You feel like you are moving in some direction, and you are but by the time you actually arrive at some substantial change, you will be 85 years old.
Considering the DB concept of "do something different", honestly my friend, you have been doing flavors of the same thing for as long as I have been with you.
Have you ever considered asking some of the hardliners like RobX or Gucci or Puppy (Puppy might be good for you, he as actually starting to seem like a moderate), and formulating a new drastically different plan?
Reading yet another book and taking yet another style of dance lesson has clearly proven not to be the answer. It would appear, your wife is screaming, dieing, crying for a manly, passionate man. If you MUST read yet another book, how about reading, No More Mr Nice Guy or Getting Your Nuts Back. I say this not in jest or to scold, but as an objective observer, this is what your wife appears to wife. Had you beat her "guest" to a pulp and strongly reprimanded her. I suspect she would have been astounded, revolted and utterly attracted all at once.
Good luck no matter what you do.
Me 44 She 46 S13 D9 M18 T23 3 years DB'ing Successfully busted