* married men live longer : http://www.health.harvard.edu/newsletters/Harvard_Mens_Healt...
;)
This isn't a trivial rhetorical flourish; this is actually a profoundly important truth about the world and statistics. You aren't dating/marrying a population... you're dating/marrying a specific member out of that population, and the direction of causality is that the population has the statistical properties it does due to its individual members. Population statistics do not casually drive the attributes of its members.
The only real-debate is wether or not marriage is a game of chance or one of skill. But distinguishing between the two helps to understand the actual complexity of the situation.
IMHO, marriage is just a millennia-old artifact concept where you inform and/or conform with your superior (church, state or whatever) on whom you're going to live with.