We're apt to fall in love with those who are mysterious and challenging to us.
From Helen Fisher
If two very different people pool their DNA, they'll create more genetic variety, and their young will come to the job of parenting with a wider array of skills.
When you can't have someone but you're not willing to accept that, you try harder and become more extreme about it. Either you win the person back or you drive him away.
Women have a better sense of smell than men do, and it's even sharper in the middle of their menstrual cycle, when estrogen levels peak and women are more likely to be deciding whether a man's attractive.
Women like signs of money and education - things that indicate that not only is this guy going to have some resources, but he's also willing to share them.
Women have a better sense of color and a better color memory. They're more likely to notice when something doesn't match; more likely to notice what you're wearing.
Touch is the mother of the senses. Not only are women more sensitive when they touch, but they're also more sensitive to being touched.
Real competition can drive up testosterone, which boosts libido.
Women spend their lives trying to look good for men. So a woman who feels she's sending the right visual signals is pleased with herself.
Once you fall for someone, their smell can be a powerful thing. Women will wear their boyfriends' T-shirts, and throughout tales in history men have held on to their lover's handkerchief.
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