Historically, sweat has been an active ingredient in perfume and love potions.
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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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When someone looks at a new love, the neural circuits that are usually associated with social judgment are suppressed.
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Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
14
Brain scans show that people who view photos of a beloved experience an activation of the caudate - the part of the brain involving cravings.
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Studies show that the risk of a “secret love” being revealed heightens romantic feelings for the partners, thanks to increased levels of phenylethylamine (PEA).
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In Korea, if you do not receive any gift on Valentine's day then all the singles go to Korean restaurants and eat black noodles to celebrate (or mourn) their single status.
28
Men who kiss their wives in the morning live five years longer than those who don't.
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