Maybe selecting a wife is about like selecting a puppy.
I mean, its pretty easy to get a pretty good wife or good dog, but finding a really GREAT dog is sorta luck, impossible to predict ahead of time.
Likewise, even with a good wife no way of knowing for sure what she's gonna do fifteen years and three kids later. Some stick for richer for poorer in sickness and in health, other's don't.
Just the way it is.
I read somewhere that 80% of divorces are initiated by the woman.
Birdwatcher