Pucker up: Kissing the same person for about six months provides optimum protection from potentially deadly germs, says Dr Colin HendrieFrom The Daily Mail:
It is an international symbol of love and romance. But the kiss may have evolved for reasons that are far more practical - and less alluring.
British scientists believe it developed to spread germs.
They say that the uniquely human habit allows a bug that is dangerous in pregnancy to be passed from man to woman to give her time to build up immunity.
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