Kissing releases masses of oxytocin, a "love potion" that helps couples bond and feel more attracted to each other.
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As a rule, 66 percent of people keep their eyes closed while kissing. The rest take pleasure in watching the emotions run the gamut on the faces of their partners.
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Parents receive 1 out of every 5 Valentines.
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People are more likely to tilt their heads to the right when kissing instead of the left (65 percent of people go to the right!)
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One in five long-term love relationships began with one or both partners being involved with others.
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The single biggest predictor of love is proximity.
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When dragonflies mate, their tails form a love heart.
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Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
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