One in five long-term love relationships began with one or both partners being involved with others.
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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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Kissing releases masses of oxytocin, a "love potion" that helps couples bond and feel more attracted to each other.
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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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'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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Two in five people in the world marry their first love.
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