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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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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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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The typical person spends about 600 hours having sex between the ages of 20 and 70.
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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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Sea otters hold hands while sleeping so they don’t drift away from each other.
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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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