Study: 80 million bacteria exchanged during 10-second kiss
What's in a kiss? About 80 million bacteria, the amount that is normally exchanged during a 10-second "French" kiss, according to a new study of smooching couples by Dutch researchers. Intimate kissing involving full tongue contact and saliva exchange appears to be an adaptive courtship behavior unique to humankind and is common in more than 90 percent of known cultures, the authors noted.
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