“Promiscuous animals, by and large, have smaller brains, for relationship demands a good deal of processing power, and promiscuity is a denial of relationship. Monogamy, as many of us know, is costly and hard: it demands work, though the pay-off can be profound. The work is often emotional work: give and take; forgiveness and forbearance.” EmotionRelationshipIntelligenceMonogamyPromiscuityBrain SizeSwifts Book:The Screaming Sky Source: The Screaming Sky