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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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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When a male gentoo penguin "falls in love" with a female penguin, he searches the entire beach to find the perfect pebble to present to her.
25
Historically, sweat has been an active ingredient in perfume and love potions.
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Couples' personalities converge over time to make partners more and more similar.
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Close to 110 million roses (mostly red) will be purchased and delivered around Valentine's Day in the U.S.
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40% of people who are rejected in romantic love slip into clinical depression.
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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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