17 Delightful Facts About Kissing

Pucker up, it's for science.

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5. When you kiss someone your heart beats faster and more oxygen reaches your brain.

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All thanks to neurotransmitters epinephrine and norepinephrine which promote the fight-or-flight response.

8. The muscle you use to pucker your lips is called the "orbicularis oris".

And the shape you make with your mouth mirrors that of a breastfeeding baby, hinting at one possible way that kissing evolved.

10. Kissing triggers the release of oxytocin in your body.

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Often called the "love hormone", though that's not all it does by a long stretch, oxytocin is involved in developing feelings of attachment. It's thought to be what keeps the love in a relationship alive long after the initial honeymoon period (and dopamine spike) is over.

11. More kissing in a relationship is related to how satisfied people say they are in that relationship.

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The same study found that this wasn't the case for having more sex. But people's satisfaction with the amount of kissing and sex was related to the quality of their relationship.

12. Women tend to rate kissing as more important in relationships than men do.

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The study, involving more than 1000 college students, also found that whereas women tend to use kissing to assess potential mates, men use it to increase the likelihood of sex.

13. The world record for the longest kiss stands at well over two days.

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It's held by Thai couple Ekkachai Tiranarat and Laksana Tiranarat who set it in the run up to Valentine's day last year, with a kiss lasting 58 hours, 35 minutes and 58 seconds.

15. When your lips touch someone else's 5 out of 12 of your cranial nerves are engaged.

You're brain is basically trying to gather as much information as it can about the other person.

17. Most people remember their first kiss more vividly than the first time they had sex.

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John Bohannon of Butler University asked 500 people about their memories of important life experiences, including their first kiss and losing their virginity. The kiss beat everything as the most detailed memory.

Additional source: The Science of Kissing by Sheril Kirshenbaum.