There's a love mattress that is specifically designed for couples who sleep on each other's arms.
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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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In 2011, archaeologists discovered the skeletal remains of a Roman couple who have been holding hands for 1,500 years.
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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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Couples' personalities converge over time to make partners more and more similar.
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Holding hands with someone you love can alleviate physical pain as well as stress and fear.
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Historically, sweat has been an active ingredient in perfume and love potions.
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