Well, my wife is killing me with "communication". If she came home and there was another women there she could "communicate" with and I did not have to absorb her stress or get in trouble by trying to fix her problems... I am sure I'd be healthier and live longer.
A little competition for my affection, without having to bring in a woman outside the marriage, would probably do wonders for me as well!
I'd like to know if the wives in a multiple-wife marriage live longer as well. Maybe this is a win-win (win-win-win).
Or course the unspoken fear is that if married to two wives there would still be no sex (with me, anyway).
If you do something right once, someone will ask you to do it again.