Eating up the other person’s lips has so much packed into it: like the next thing you do on your first date; the wet, Frenchy lock of lips and tongues when you get the hots; part of the niceties you ritually go through on social meet-ups; and the reflect show of affection for those cute tiny patters—when you can’t like infect them with flu bugs.

Okeydokey.

You probably don’t realize you get more than those hair-raising titillation and good-mum feelings from kissing and swapping spit.

Below are scientifically proven health benefits of kissing:

1. Kissing boosts immunity.A recent study reported in the journal Medical Hypotheses says kissing may increase a woman’s immunity from Cytomegalovirus. Cytomegalovirus, contracted through mouth to mouth contact, can cause infant blindness and other birth defects if the mother is a carrier during pregnancy. Otherwise, the bug is relatively harmless in adults. Kissing has long been thought to be a way to pass along bugs and thus strengthen the body’s defenses.
2. Kissing helps you pick the best mate. Anthropologist Helen Fisher describes kissing as a “mate assessment tool.”

“Much of the cortex is devoted to picking up sensations from around the lips, cheeks, tongue and nose. Out of 12 cranial nerves, five of them are picking up the data from around the mouth. It is built to pick up the most sensitive feelings—the most intricate tastes and smells and touch and temperature. And when you’re kissing somebody, you can really hear them and see them and feel them. So kissing is not just kissing. It is a profound advertisement of who you are, what you want and what you can give.”

Other researchers note that kissing is biology’s way of determining who in nature you are most genetically compatible with.

“At the moment of the kiss, there are hard-wired mechanisms that assess health, reproductive status and genetic compatibility,” says Gordon G. Gallup Jr., a professor of evolutionary psychology at the State University of New York at Albany who studies reproductive competition and the biology of interpersonal attraction. “Therefore, what happens during that first kiss can be a make-or-break proposition.”

3. Kissing burns calories! Depending on different reports, anywhere from 2 to 6 calories a minute. Not quite a jog on the treadmill, but an hours worth of smooching may burn off half a handful of M&Ms or half a glass of wine. Hey, it’s something.
4. Kissing keeps facial muscles strong. Sure tight abs or cellulite-free thighs may be first on the Tone Up list, but don’t underestimate the workout your mouth gets during a makeout session. Researchers say you use 30 muscles while kissing and the smooching helps keep your cheeks tight. Nice. We’ll take what we can get.
5. Kissing naturally relaxes you.Scientific reports say kissing increases the levels of oxytocin, the body’s natural calming chemical and also increased endorphins, the body’s feel-good chemicals. Swapping spit is also noted to increase dopamine, which aids in feelings of romantic attachment.

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