Kissing an infection-free partner is good for your teeth!
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A man's beard grows fastest when he anticipates sex.
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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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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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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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A couple had their wedding rings engraved with a waveform of their own voices saying "I do."
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In 2011, archaeologists discovered the skeletal remains of a Roman couple who have been holding hands for 1,500 years.
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