Ask a 22-year-old and a 68-year-old to define cheating, and you may get two different relationships entirely. In a February 2023 poll of 1,500 U.S. adults conducted by Redfield & Wilton Strategies for Newsweek, 43 percent of Gen Z respondents said a relationship has to turn physical to count as cheating, compared with roughly 30 to 35 percent of Gen X and Baby Boomer respondents. Meanwhile, nearly six in ten adults over 55 said a purely emotional entanglement counts on its own. The generational split isn’t just about texting habits or social media use. It’s about where the line for betrayal actually sits, and the data suggests that line has moved further than most couples realize.
The Emotional Affair Divide
The Redfield & Wilton numbers, broken down by age band, show a fairly steady climb: 43 percent of 18-to-24-year-olds require physical contact to call something cheating, dropping to 37 percent among 25-to-34-year-olds, then settling in the low 30s for everyone from 35 to 64. Flip that around and the pattern is just as clear. Only 48 percent of Gen Z respondents said a nonphysical relationship counts as cheating, while 58 to 59 percent of Gen X and Boomer respondents said the same. That’s roughly a 10-point gap on the single most consequential question in the entire survey: does an affair need a body to be real.
It’s tempting to read that as Gen Z being more permissive across the board, but the same poll found something that complicates that story. Gen Z respondents were also far more open to the idea of an open relationship in the first place, with 35 percent saying yes compared to just 7 percent of 55-to-64-year-olds. So the younger generation isn’t necessarily loosening the definition of cheating within a monogamous relationship. Many of them are questioning whether strict monogamy is the default at all, which changes what “crossing a line” even means before you get to the specific behavior.
What Older Generations Learned From Marriage Itself
Older generations’ stricter read on emotional infidelity tracks with research on how digital life reshaped marriage specifically. The 2019 “State of Our Unions” study from the National Marriage Project at the University of Virginia and the Wheatley Institution at Brigham Young University, based on a YouGov survey of 2,000 nationally representative adults and summarized by the Institute for Family Studies, found that just 18 percent of millennials believed all forms of electronic behavior that blur romantic and sexual lines are inappropriate, versus 26 percent of Baby Boomers. That’s not a huge gap, but it lines up with a broader theme: the generation that built its marriages before smartphones existed tends to treat any digital gray area with more suspicion than the generation that has never dated without one.
The same body of research found that a majority of adults, across generations, don’t consider following a former partner online or real-life flirting with someone outside the relationship to be cheating on their own. Where consensus falls apart almost entirely is the space in between: prolonged texting, sexual conversations online, and secret emotional relationships that never go physical. Those are exactly the behaviors where a couple with a 20-year age gap, or even a 10-year one, might be operating from two different rulebooks without ever having said so out loud.
The Behaviors Nobody Fully Agrees On
A more recent nationwide survey of 2,000 married and partnered Americans, conducted by Talker Research in July 2026, put numbers on how contested some of the most common modern behaviors still are. Saving a contact under a fake name was called cheating by 37 percent of respondents overall. Secretly keeping in touch with an ex landed at 36 percent. Flirtatious texting topped the list at 41 percent, but that still means well under half of the people surveyed considered it clearly off-limits. On the generational question specifically, developing romantic feelings for someone outside the relationship was flagged as cheating by 31 percent of Gen Z respondents compared to only 21 percent of millennials, a reversal of the pattern seen in the emotional-affair data and a reminder that these attitudes don’t move in one tidy direction by age.
Why the Gap Matters More Than the List
What makes this generational split genuinely risky isn’t any single behavior. It’s the assumption that your partner is using your definition of cheating without either of you ever checking. A Gen Z partner who thinks emotional affairs are a gray area isn’t necessarily being cavalier. They may have grown up watching relationships negotiate boundaries out loud in a way older generations never had to, because older generations didn’t have a phone lighting up with someone else’s name on it every night. A Boomer partner who considers a flirty text a serious betrayal isn’t overreacting by their own standard. They came of age when infidelity had a much narrower, more physical definition, and digital life simply expanded what counts as crossing into someone else’s territory.
The surveys agree on one thing across every generation: sexual contact, secret meetups, and cybersex are cheating, full stop. Everything else lives in a gap that’s widened rather than narrowed as technology changed how people connect with people who aren’t their partner. That gap is worth naming out loud, in your own relationship, before it gets defined for you by an argument.
