BANGKOK – A new round of widely shared data has put Thailand at the top of global infidelity rankings. Based on figures compiled by World Population Review, 51% of married adults surveyed said they’ve had sex outside their marriage at least once.
That number has fueled big conversations online and in the media, and it places Thailand ahead of many European countries that often appear near the top of these lists.
The 51% figure comes from self-reported surveys that World Population Review aggregates, with recent write-ups also pointing to sources such as BedBible and Insider Monkey. Cheating happens everywhere, but Thailand’s reported rate stands out. It’s pushed many people to talk about social norms, relationship expectations, and how marriage is changing in a country known for its busy cities and strong mix of tradition and modern life.
Why Infidelity Rates Are Reported as High in Thailand
Several factors often come up when people try to explain Thailand’s numbers. One is the long-known idea of mia noi (a “minor wife”), where some men, often those with money or status, keep a long-term mistress while staying married. It’s not accepted by everyone, and it’s not practiced by all, but it has historical ties to older polygamous customs. In some circles, especially among older generations, it may be tolerated or quietly ignored.
Thailand’s nightlife and entertainment scene is another part of the story. Cities like Bangkok, Pattaya, and Phuket offer plenty of chances to meet people discreetly. Tourism, bars, and online dating tools can make affairs easier to start and easier to hide.
Money and stress can matter, too. Financial pressure, routine in long relationships, and the desire for novelty can push some people toward an affair. For others, it’s about unmet emotional needs, not just sex.
Gender patterns also show up in research and reporting. Studies often find that men, especially those ages 30 to 60, are more likely to admit to cheating. Common reasons include feeling ignored, losing closeness at home, or having more chances to stray.
At the same time, more women report affairs than in the past. Some describe feeling unwanted, dealing with low confidence, or looking for emotional support they don’t get from their spouse. Some also see emotional or online relationships as a gray area, even if their partner wouldn’t agree.
Social attitudes play a role as well. In some relationships, people don’t talk openly about feelings, conflict, or dissatisfaction. When problems stay unspoken, resentment can build. Compared with some nearby countries where the stigma is stronger, Thailand is often seen as more forgiving of cheating, especially when men do it. Add dating apps and private messaging, and it becomes easier for secret relationships to happen.
That said, views aren’t fixed. Many younger, city-based Thais talk more about fairness, honesty, and clear boundaries. As gender roles shift and more women have their own income, expectations around monogamy and accountability may continue to change.
The Top 10 Countries for Infidelity (World Population Review Data)
World Population Review’s compiled rankings list the share of married people who say they’ve had extramarital sex at least once. Thailand ranks first. Many of the other top countries are in Europe, where surveys often show more flexible attitudes toward monogamy and cheating.
Here are the top 10 based on recent aggregated reports:
- Thailand– 51%
- Denmark– 46%
- Germany– 45%
- Italy– 45%
- France– 43%
- Norway– 41%
- Belgium– 40%
- Spain– 39%
- Finland– 36% (tied in some reports)
- United Kingdom– 36% (with Canada and Greece in similar ranges)
These numbers suggest a pattern in the reporting: higher rates cluster in parts of Europe, where fewer people say cheating is always wrong. In more conservative regions, reported rates are often lower, though stigma can also make people less willing to admit it in surveys. Definitions can also vary, since some people count only sex while others include emotional affairs.
Thailand is the only Asian country that consistently appears near the very top in these lists, which is one reason the ranking has drawn so much attention.
What This Could Mean for Marriage and Society
A high reported rate of cheating doesn’t always mean marriages end quickly . Many affairs stay hidden, and some couples remain together despite them, sometimes through silent agreement and sometimes through painful compromise. In many cases, cheating points to unmet needs, poor communication, or long-term dissatisfaction.
Public interest in these numbers also connects to real-world outcomes. Infidelity is a leading reason for divorce in many places. In Thailand, cheating can also bring legal risks under civil law, including compensation claims in some situations.
At the same time, survey-based rankings have limits. People answer differently depending on culture, personal shame, and what they believe “infidelity” includes. Still, the fact that several sources repeat similar results has helped keep Thailand in the spotlight.
As global travel, social media, and dating apps shape modern relationships, Thailand’s ranking has become a talking point far beyond its borders. It’s also a reminder that the most private choices in a marriage can reflect larger social habits, pressures, and changing expectations.
