Philematology

The Italians use the expression baciare co' denti (kiss with the teeth) to signify "to love." We can only treat these kisses as a sort of transitional link, of shorter or longer duration, according to circumstances. They are, as it were, "a sea fraught with perils," which in Mlle. [Madeleine] de Scudéry's celebrated letter (la carte de tendre), carries one to strange countries (les terres inconnues); but, as these countries lie outside the regions of pure philematology, I shall not pursue my investigations further.

Although philematology (the art and science of lip-locking) remains largely unstudied, researchers have proven that kissing not only decreases levels of cortisol, a chemical that creates stress, but also increases oxytocin, a chemical that heightens feelings of affection and potentially fights depression and disease.

"Now the flip side of this whole kissing as exercise thing is that, like, hundreds of bacteria are exchanged in a kiss—so you know …" she extended her arms in a balancing gesture, "it's all risk-benefit and yeah, all in the name of philematology—that's the actual scientific term used for the study of kissing. Oh and get this, a woman has usually kissed about seventy-nine men before she finally settles and gets married."

There's a lot riding on a kiss, as work in philematology suggests, since the act appears to set off a complex set of chemical reactions that enhance romantic feelings and make physical acts like sexual intercourse much more meaningful.