When you are looking at someone you love, your pupils dilate, they do the same when you are looking at someone you hate.
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In Korea, if you do not receive any gift on Valentine's day then all the singles go to Korean restaurants and eat black noodles to celebrate (or mourn) their single status.
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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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The average person in their lifetime will spend an estimated 20,160 minutes kissing!
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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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If you mouth the word "colorful" to someone, it looks like you are saying "I love you".
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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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