Kissing an infection-free partner is good for your teeth!
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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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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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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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40% of people who are rejected in romantic love slip into clinical depression.
72
Raj from the Big Bang Theory is married to Miss India.
11
Sandy, an African Penguin, has been in 'love' with her keeper at the Nuremburg zoo since 1996.
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Kissing releases masses of oxytocin, a "love potion" that helps couples bond and feel more attracted to each other.
13