Kissing seems instinctive, yet as writer Albert Cohen poetically called it, the act of "welding together two digestive tracts" (1) has been extensively studied by scientists, affirming that "Eros is the life."
Research shows that kissing frequency correlates with relationship satisfaction—the more often couples kiss, the happier they feel. Psychologist Gordon Gallup found that 59% of men and 66% of women have ended potential relationships due to poor kissing. Beyond technique, it's often a chemical mismatch in saliva that triggers cortisol, the stress hormone.
This milestone is pivotal: 90% of people (2) vividly recall their first kiss—details like location and who initiated—far more than their first sexual experience. Notably, sex workers avoid kissing clients, viewing it as too intimate to preserve emotional boundaries (3).
Kissing serves as a biological compatibility test. Studies suggest it exchanges olfactory, tactile, and postural cues that unconsciously assess genetic match for reproduction. Rather than idealizing a partner prematurely, a kiss provides clear signals.
Men tend to view kissing as a prelude to sex and are less discerning, while women scrutinize taste, breath, and overall appeal. Surveys reveal men prefer enthusiastic, moist kisses, encouraging women to take initiative rather than being overly passive.
(1) Solal, Gallimard editions
(2) Study by psychologist John Bohannon of Butler University.
(3) Research by Joanna Brewis and Stephen Linstead in Sex, Work and Sex Work.
