Let’s be honest: most of us have at least one story involving a sizzling acquaintance who managed to dazzle and befuddle in equal measure—a classic case of “smolder, then ghost.” But science, it seems, now offers a peculiar footnote for your relationship memoirs. According to a wave of recent research, that inexplicably magnetic (and perhaps mildly manipulative) ex may have come by their allure honestly—courtesy of something psychologists are calling the “dark triad” effect.

The Suspiciously Trustworthy Face

Among the odder psychological findings to land this year is the revelation that people with so-called “dark triad” traits—narcissism, psychopathy, and Machiavellianism—aren’t just good at pretending to be trustworthy. As detailed in a Newsweek report that summarizes research published in Personality and Individual Differences, individuals with higher levels of these traits actually look more trustworthy to others, thanks largely to being seen as more attractive.

The research, led by psychologist Professor Qi Wu of Hunan Normal University, involved nearly 600 participants who rated strangers’ faces in a series of experiments involving simulated trust games and perception tasks. Time and again, those who scored high in dark triad traits were rated as both attractive and trustworthy—despite, as Newsweek explains, their personalities leaning toward cunning self-interest. Professor Wu stated that in short-term cooperative settings, such individuals “tend to inspire more trust, partly due to being seen as more attractive based on their facial features.” It’s a case where judging a book by its cover might be exactly what the book is banking on.

Charm, Confidence, and a Dash of Manipulation

So why do these darker types get such high marks? Newsweek outlines how narcissists tend to radiate confidence and polish, psychopaths deploy charm and social strategy even without much empathy, and Machiavellians possess a knack for reading and working a room. These social skills translate into facial cues or expressions that, for whatever reason, tip the scales for observers—even in the blink-and-you’ll-miss-it context of a brief encounter.

East Coast Radio, in an article summarizing the Newsweek report and the underlying study, highlights the phenomenon’s reflection in pop culture: the familiar tales of Ted Bundy and Jeffrey Dahmer, both described as attractive and charismatic, and the fictional yet oddly relatable Joe Goldberg from Netflix’s “YOU.” Even with actor Penn Badgley’s frequent reminders that his character is, in fact, a murderer, fans apparently can’t resist the gravitational pull. Does a symmetrical jawline make us forget to ask questions? Science suggests, alarmingly, that sometimes it does.

Why We Fall For It

Psychology professor Jason Walker, interviewed by Newsweek, breaks down the explanation with a touch of evolutionary irony: the “halo effect.” In his words, “We’re hardwired to associate attractiveness with trust, a psychological shortcut known as the halo effect.” Dark triad personalities, Walker asserts, have become masters of this art, orchestrating their external projection to win trust quickly—sometimes securing leadership roles or social clout before anyone’s had time to look beneath the surface.

Newsweek underscores his advice on sidestepping these shortcuts: true character shows in “how someone engages with people they don’t need to impress.” It’s a small but potent reminder that lasting trust should be rooted in humility and consistency, not just charisma or surface polish.

Seeing Past the Facade

On the subject of spotting these traits, Newsweek—citing a 2018 study—clarifies just how hit-or-miss our instincts really are. Participants could somewhat reliably pick out narcissism (in both men and women) and psychopathy (in men), but tended to miss psychopathy in women and Machiavellianism altogether. In other words: the connection between facial cues and underlying traits is inconsistent, leaving observers with little more than a hunch that “something is off.”

East Coast Radio, reflecting on this summary, reminds readers that not every confident charmer is hiding a diabolical secret. Still, when you find yourself swept along by someone’s good looks and surface appeal, it’s likely your own brain’s hardwired shortcut—“trust the pretty face”—that’s nudging you forward.

So, whether you’re updating the scrapbook of questionable exes or just reflecting on our collective fallibility, science now lends an extra explanation for why some faces inspire trust even when they shouldn’t. Are we destined to keep mixing up confidence with character, or are there lessons hidden in the very patterns we keep tracing? If history—and psychology—are any guide, all we can say for sure is: proceed with curiosity, maybe a raised eyebrow, and perhaps a little more skepticism, even when the packaging is immaculate.