Kissing releases masses of oxytocin, a "love potion" that helps couples bond and feel more attracted to each other.
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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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In 2010, Gary Richmond was beaten into a coma. He woke up with amnesia and no memory of his wife of 20 years. Subsequently, he ended up falling in love with her all over again!
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Falling in love raises levels of nerve growth in a person's brain for about a year and can improve their memory.
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Historically, sweat has been an active ingredient in perfume and love potions.
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When dragonflies mate, their tails form a love heart.
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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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In 2011, archaeologists discovered the skeletal remains of a Roman couple who have been holding hands for 1,500 years.
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