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Kissing also stimulates the brain hormones, dopamine and oxytocin— both of which promote bonding and attachment in human beings. The theory goes that people are attracted to a mate who has different MHC genes, who, if mated with, would potentially produce a baby with a more diverse immune system that is better able to fight disease. Is there a biological rational for kissing? Well, I guess that depends on your definition of a good kisser and a good lover. Yes, because kissing stimulates the production of the so-called happy hormones or neurotransmitters serotonin, dopamine and oxytocin while reducing the production of the stress hormone, cortisol. But, when is a kiss not just a kiss, depends on the honesty and sincerity of the kissers. New research points to potential downsides of fitness apps The upsides are impressive but the downsides include obsessive behaviour and burnout. Anthropologist, Helen Fisher says that when we partake in mouth-to-mouth kissing, we share saliva which has testosterone in it which enhances our sex-drive. But, evolutionary psychologist, Gordon Gallup from the University of Albany says that in long-term relationships, the frequency of kissing is a good barometer of the health and wellbeing of that particular bond.

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