Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
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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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40% of people who are rejected in romantic love slip into clinical depression.
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Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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Erotomania is a type of delusion in which the person believes another person is in love with him/her.
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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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Holding hands with someone you love can alleviate physical pain as well as stress and fear.
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The typical person spends about 600 hours having sex between the ages of 20 and 70.
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