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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One in five long-term love relationships began with one or both partners being involved with others.
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When someone looks at a new love, the neural circuits that are usually associated with social judgment are suppressed.
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Couples' personalities converge over time to make partners more and more similar.
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Men who kiss their wives in the morning live five years longer than those who don't.
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A man's beard grows fastest when he anticipates sex.
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The typical person spends about 600 hours having sex between the ages of 20 and 70.
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