Studies show that the risk of a “secret love” being revealed heightens romantic feelings for the partners, thanks to increased levels of phenylethylamine (PEA).
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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 you fall in love, that 'high' feeling is caused by a flood of dopamine that is similar to that of cocaine.
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Couples' personalities converge over time to make partners more and more similar.
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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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Historically, sweat has been an active ingredient in perfume and love potions.
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The single biggest predictor of love is proximity.
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