Kissing an infection-free partner is good for your teeth!
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Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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One in five long-term love relationships began with one or both partners being involved with others.
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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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You burn 26 calories in a one minute kiss.
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Historically, sweat has been an active ingredient in perfume and love potions.
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Wearing red increases attraction.
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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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