Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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Historically, sweat has been an active ingredient in perfume and love potions.
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Couples' personalities converge over time to make partners more and more similar.
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'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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Gary Kremen, founder of match.com, lost his girlfriend to a man she met on match.com.
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People are more likely to tilt their heads to the right when kissing instead of the left (65 percent of people go to the right!)
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