11. United Kingdom – 36%
The United Kingdom has a 36% infidelity rate among married women. Modern British society blends tradition with evolving social norms, which can create environments where extramarital relationships occur. Workplace interactions, long-distance travel, and urban lifestyles provide opportunities, while social media and dating platforms further increase exposure. Despite the perception of British propriety, infidelity remains relatively common, reflecting a nuanced balance between commitment and temptation.