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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Historically, sweat has been an active ingredient in perfume and love potions.
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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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You burn 26 calories in a one minute kiss.
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There's a love mattress that is specifically designed for couples who sleep on each other's arms.
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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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8 out of 10 people think that the first kiss indicates how the rest of the relationship will be.
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