Kissing releases masses of oxytocin, a "love potion" that helps couples bond and feel more attracted to each other.
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When dragonflies mate, their tails form a love heart.
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Men who kiss their wives in the morning live five years longer than those who don't.
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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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If you mouth the word "colorful" to someone, it looks like you are saying "I love you".
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In medieval Italy, if a man was caught kissing a woman in public, he had to marry her whether he liked it or not.
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Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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