Kissing releases masses of oxytocin, a "love potion" that helps couples bond and feel more attracted to each other.
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A couple had their wedding rings engraved with a waveform of their own voices saying "I do."
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Sea otters hold hands while sleeping so they don’t drift away from each other.
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In Finland, Valentine's Day is called "Ystävänpäivä" which translates into "Friend's day".
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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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Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
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