Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
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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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Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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In Finland, Valentine's Day is called "Ystävänpäivä" which translates into "Friend's day".
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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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8 out of 10 people think that the first kiss indicates how the rest of the relationship will be.
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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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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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