Men who kiss their wives in the morning live five years longer than those who don't.
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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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Historically, sweat has been an active ingredient in perfume and love potions.
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If you mouth the word "colorful" to someone, it looks like you are saying "I love you".
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Couples' personalities converge over time to make partners more and more similar.
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People are more likely to tilt their heads to the right when kissing instead of the left (65 percent of people go to the right!)
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Raj from the Big Bang Theory is married to Miss India.
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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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