“Specifically, they found that merely sniffing a woman’s tears – even when the crying woman is not present — reduces sexual arousal in men. Humans, like most animals, expel various compounds in body fluids that give off subtle messages to other members of the species. A number of studies in recent years, for instance, have found that substances in human sweat can carry a surprising range of emotional and other signals to those who smell them. But tears are odorless.”
http://esciencenews.com/articles/2011/01/06/weizmann.institute.scientists.discover.a.chemical.signal.human.tears?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+eScienceNews%2Fpopular+%28e%21+Science+News+-+Popular%29
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Very interesting, I’ve actually heard about how smell helps to find a proper individual (with a different immune system to ours) to mate with the purpose of creating better children with an improved immune system.