There's a love mattress that is specifically designed for couples who sleep on each other's arms.
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In medieval Italy, if a man was caught kissing a woman in public, he had to marry her whether he liked it or not.
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When you are looking at someone you love, your pupils dilate, they do the same when you are looking at someone you hate.
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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.
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Gary Kremen, founder of match.com, lost his girlfriend to a man she met on match.com.
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Couples' personalities converge over time to make partners more and more similar.
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Historically, sweat has been an active ingredient in perfume and love potions.
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A couple had their wedding rings engraved with a waveform of their own voices saying "I do."
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