Can you imagine the hurt feefees when a guy with a 5'8" wingspan tries to embrace them and his fingertips don't touch? If they stick to guys with 6'6" wingspans they won't be reminded of their enormous circumference. Women, generally but not always, like to feel petite. Men, generally but not always, like to feel big. So generally but not always, women like their men to be bigger than them and men like their women to be smaller than them. The only way that equations can ever work for a woman who is 200+lbs is if she finds a guy who is 6'4" 220lbs.