Kissing releases masses of oxytocin, a "love potion" that helps couples bond and feel more attracted to each other.
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The single biggest predictor of love is proximity.
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There's a love mattress that is specifically designed for couples who sleep on each other's arms.
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In 2011, archaeologists discovered the skeletal remains of a Roman couple who have been holding hands for 1,500 years.
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Two in five people in the world marry their first love.
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Brain scans show that people who view photos of a beloved experience an activation of the caudate - the part of the brain involving cravings.
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