Research studies using similar T-shirt experiments have shown that whose smell a person prefers is dictated by a set of genes that influence our immune response - which researchers say is nature's way of preventing inbreeding and preserving genetic adaptations developed over time.
"Humans can pick up this incredibly small chemical difference with their noses," said Martha McClintock, founder of the Institute for Mind and Biology at the University of Chicago. "It is like an initial screen."
In one such study, McClintock and her colleagues had participants sniff inside a covered box without knowing that in some cases they were smelling worn T-shirts. What they found was people preferred the odors of those who had different genetic makeups from their own, but not radically different.
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