The science of kissing is called Philematology, and it’s just as unsexy as it sounds.
When you swap spit with unsuspecting partners, you’re sharing more than you think. For every 10 seconds spent at first base, you transfer 80,000,000 bacteria from one mouth to another. The cleanest mouths among us harbor between 1,000 and 100,000 bacteria on the surface of each tooth. Those of you not brushing and flossing on the regular are providing sanctuary to anywhere from 100 million to 1 billion bacteria on every single one of your (not-so) pearly whites. Hosting that kind of liveliness in a space kept at a humid 95-ish degrees makes our mouths the “tropical rainforest” of the body.
While lips may be our largest-exposed erogenous zone, the nasty stuff lurking on the surface of that area is a serious turn-off.
Each adult human has about 400 different species of microorganisms living in his or her mouth, waiting to be shared. Tonsil hockey is a primo vehicle for “contact spread” -- the transfer of disease through direct, contaminated touch. But there’s more! “Droplet spread” is also super easy while making out because of orifices like the eyes, nose and mouth.