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Sexual intercourse is actually a beauty treatment. Research shows that when women make love, their production of the hormone estrogen, which makes their hair and skin smooth, increases. Soft, relaxed love making also reduces the risk of dermatitis and other skin concerns. The sweat that is produced cleanses the pores and gives the skin a nice glow. In fact, sex makes people look 4-7 years younger according to a study from Royal Edinburgh Hospital in Scotland.