Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
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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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A man's beard grows fastest when he anticipates sex.
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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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Cuddling (or other ‘love’ acts) helps to heal physical wounds faster due to the release of Oxytocin which is proven to reduce swelling.
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Couples' personalities converge over time to make partners more and more similar.
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In Korea, there's a man named Lee Jin-gyu who fell in love and married his life-sized Japanese body pillow (called a "dakimakura").
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Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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