I fail to see how it's 'just a guess', by any stretch of the imagination. Agriculture introduced a larger amount of resources on a scale not seen before. Evol

I fail to see how it's 'just a guess', by any stretch of the imagination. Agriculture introduced a larger amount of resources on a scale not seen before. Evolutionary psychologists successfully predicted that women who preferentially mated with men capable of investing resources in their offspring (thereby ensuring their offsprings' survival) would have left more descendants than women who did not. (http://en.wikipedia.org/wiki/Human_mating_strategies#Sexual_attraction http://en.wikipedia.org/wiki/Human_mating_strategies#Sexual_...). This is not the only factor, but it is a large factor. So for while most of our biological history nature selected for favorable physical attributes (virility, strength, agility, immunity, etc.) fitting the external environment, cultural institutions selected instead.