The ideal male has a big jaw, a broad chin and an imposing brow. Square-jawed males are more likely to attain higher rank in the military. Greater symmetry also predicted a larger number of past sex partners. Women with highly symmetrical partners were more than twice as likely to climax during sexual intercourse. Men with symmetrical bodies are typically larger than their peers, more muscular, athletic and dominant in personality.
Women are more sexually responsive to symmetrical men.
Men who have it exploit that advantage. Extremely symmetrical men are less attentive to their partners and more likely to cheat on them. Women show no such tendency. Our innate tendency to prefer symmetry unfortunately doesn't prepare us to prefer integrity, personal worth, or life in complex technological societies. One genetic characteristic that symmetry reveals is genetic diversity.