'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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Men who kiss their wives in the morning live five years longer than those who don't.
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Couples' personalities converge over time to make partners more and more similar.
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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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Historically, sweat has been an active ingredient in perfume and love potions.
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For Valentine's Day 2014, an unnamed man sabotaged a special screening of "Beijing Love Story" at a Shanghai cinema by booking every other seat, subsequently preventing couples from sitting together.
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Speed dating was invented by a Rabbi in 1999.
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