Heavy social media users. 
According to research from Cyberpsychology, Behavior and Social Networking(link is external), “the more often a person uses Twitter, the more often they have relationship conflicts…culminat[ing] in cheating, breakups and divorce.” Time wasn’t a factor for these results—couples that had been together for a short time experienced the same social-media effect as couples that had been together for many years. (Previous studies have suggested similar results for heavy
Facebookusers, too.)
Men whose age ends in 9. 
Researchers who analyzed data(link is external) from Ashley Madison, a
dating website for adults seeking extramarital flings, found that a higher percentage of men on the site were aged 29, 39, 49, or 59. In other words, men facing a milestone year in their lives seem the most prone to cheating.
Someone who has already cheated. 
As much as we’d like to
forgive and move past infidelity in our relationships, science suggests we think twice.
According to research from the University of South Alabama(link is external), both men and women who are unfaithful in one relationship are more likely than others to be unfaithful in the next one.
Friskier mates. 
According to intimacy expert Mary Jo Rapni(link is external), having a partner who is suddenly more physically affectionate with you could mean he or she is cheating. “When a man starts cheating, he becomes hyperactive sexually,” she says. Because his
sex drive has been aroused, he starts craving more intimacy—and when his mistress isn’t around to satisfy his needs, his wife becomes the next best thing.
Wealthier men and poorer women. 
The rich men part shouldn’t be surprising: Just look at any extramarital relationship exposed in Hollywood or Washington D.C.
Armed with power and money(link is external), men can become fluent in the language of illicit affairs. The surprise here is that poor women are more likely to cheat than wealthier peers. Though
the explanations vary, (link is external)some evolutionary biologists theorize that lower-income women cheat in hopes of moving up the genetic (or financial) ladder for the presumed benefit of their children.
