'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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Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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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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Couples' personalities converge over time to make partners more and more similar.
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The average person will go on a date at least 100 times before they finally marry.
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40% of people who are rejected in romantic love slip into clinical depression.
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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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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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