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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One in five long-term love relationships began with one or both partners being involved with others.
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Historically, sweat has been an active ingredient in perfume and love potions.
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A man's beard grows fastest when he anticipates sex.
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Kissing releases masses of oxytocin, a "love potion" that helps couples bond and feel more attracted to each other.
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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 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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