The Science of Kissing

The Science of Kissing explores the biological, cultural, and historical dimensions of kissing, blending evolutionary biology, psychology, and anthropology. Sheril Kirshenbaum examines why humans kiss, how kissing varies across cultures, and its role in relationships, drawing on studies about hormones, animal behavior, and historical practices.

This book is ideal for romantics, science enthusiasts, and readers curious about human behavior. Its accessible tone appeals to those interested in biology, cultural anthropology, or the intersection of science and everyday life, offering insights without requiring a technical background.

Yes, for its engaging mix of science and storytelling. While some critics note it’s lighter on technical depth, the book’s charm lies in its exploration of kissing’s history, gender differences, and fun facts—making it a delightful read for casual learners and science newcomers.

Kirshenbaum traces kissing’s origins to ancient civilizations, suggesting it may have evolved from sniffing behaviors in primates or shared food practices. She highlights its role in rituals, from Roman greetings to medieval courtship, and how cultural norms shaped its significance over time.

The book proposes kissing evolved to assess genetic compatibility via pheromones or as a bonding mechanism to release oxytocin. Kirshenbaum also compares human behavior to animals, like bonobos’ “kiss-like” gestures, to explore its biological roots.

While Western cultures often romanticize kissing, 10% of societies avoid it entirely. Kirshenbaum contrasts practices like France’s la bise (cheek kisses) with regions where kissing is taboo, linking these differences to societal values and historical traditions.

Kissing triggers dopamine (linked to pleasure) and oxytocin (bonding hormone), reinforcing emotional connections. Men may prefer sloppier kisses to transfer testosterone, while women use kissing to evaluate potential partners’ health and genetic fitness.

Yes! Kirshenbaum includes science-backed advice: maintain oral hygiene, experiment with pressure, and prioritize mutual comfort. She humorously notes that 66% of people tilt their heads right during kisses—a quirk tied to fetal positioning.

It describes animals with kiss-like actions, such as elephants intertwining trunks and bonobos using mouth-to-mouth contact for reconciliation. These behaviors suggest evolutionary parallels, though human kissing uniquely combines sensory, emotional, and cultural layers.

Some reviewers argue it prioritizes anecdotes over rigorous science, with limited citations. However, its strength lies in making complex topics accessible, blending historical trivia with light neuroscience for broad appeal.

As a marine biologist-turned-science communicator, Kirshenbaum bridges academic research and public understanding. Her work on ScienceDebate and science policy informs the book’s focus on clear, engaging storytelling about human behavior.

Kirshenbaum references a 1960s study where 15% of couples reported kissing led to love, and quotes Marcel Proust: “A kiss is a secret told to the mouth instead of the ear.” These moments underscore kissing’s emotional and scientific complexity.