84:1.9

Regardless of the antagonisms of these early pairs, notwithstanding the looseness of the association, the chances for survival were greatly improved by these male-female partnerships. A man and a woman, co-operating, even aside from family and offspring, are vastly superior in most ways to either two men or two women. This pairing of the sexes enhanced survival and was the very beginning of human society. The sex division of labor also made for comfort and increased happiness.