In Finland, Valentine's Day is called "Ystävänpäivä" which translates into "Friend's day".
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Kissing releases masses of oxytocin, a "love potion" that helps couples bond and feel more attracted to each other.
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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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Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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Wearing red increases attraction.
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Men fall in love faster than women do.
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