'X' became symbolic for a kiss because in the middle ages when alot of people were illiterate and they used to sign documents with an X and then kiss it for sincerity.
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8 out of 10 people think that the first kiss indicates how the rest of the relationship will be.
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Wearing red increases attraction.
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When you fall in love, that 'high' feeling is caused by a flood of dopamine that is similar to that of cocaine.
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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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Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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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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Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
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