As the old saying goes it takes two to tango. A third throws off the entire dance.
The tango is sensual yet aggressive - there is lots of back and forth. It's a fine example of pent up/release.
If you want mystery and excitement in a R with longevity you choose one tango partner and make the "dance" a bit different each day. There is no room for a THIRD partner. Committed R's aren't much different.
If your W wants somebody to spoil and adore her with little intention to CONTRIBUTE anything to the R tell her to call her daddy. If she wants to "tango" with you tell her to get on board. If not there are plenty of women out there who have would be more than happy to dance with you in a long term fashion and shun the idea of boredom in a R.