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Whether you're smooching a new fling or smacking lips with your long-term lover, kissing has tons of health benefits besides just feeling good. It's a major stress reliever and gives your facial muscles a workout, which can make you look younger, and the saliva produced when french kissing can help prevent tooth decay. You'll even burn calories — 40 during a 20-minute kiss fest — and making out also boosts your immunity. Now that's more than enough reason to grab your partner and start necking.

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