Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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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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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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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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Studies show that the risk of a “secret love” being revealed heightens romantic feelings for the partners, thanks to increased levels of phenylethylamine (PEA).
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The left ear is more responsive to words of love and emotion whispered into it than the right.
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When a male gentoo penguin "falls in love" with a female penguin, he searches the entire beach to find the perfect pebble to present to her.
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