What turns you on? Full lips? Broad shoulders? A robust bank account? "Natural selection" is the so-called 'survival of the fittest,' but there's another process at work: "sexual selection." It encourages the development of traits that differentiate male from female to help attract a mate. Scientists now know that humans are no exception to the rule. They're putting the chemistry of love, lust and commitment under the microscope to find out exactly what turns us on and why.

Pass: What's SEXY

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