Brits are Number 1 on the top 10 list of women signing up to have extra-marital affairs, beating Sweden into second place and the US third, the Daily Star reported.
Victoria Milan, a dating website for married people, carried out the research for International Women's Day.
The firm said that they always see a surge in sign-ups in the run-up to International Women?s Day, which celebrates women?s rights across the world.
In 2013, there was a 37% rise in female sign-ups. Other findings show that 68% of 4,000 surveyed say they are unfaithful because of a lack of good sex.
Some 32% are looking for a one-night stand, with 46% looking for something more short term.
And 22% want to have a relationship while staying with their husbands.
According to the survey, 38% of the play-away ladies in UK are over 40. In Sweden, 36% of them are sexy cougars.
Meanwhile in the United States, 22% are single women looking for a married man, while in Ireland, 46% are looking for just a one- night stand with each lover.
In France, 20% are open to an affair, and 26% of Dutch are looking for lovers of both genders to satisfy their bisexual fantasies.
In Finland, 42% spend an average of more than two hours a day online looking for a lover, and in Belgium, 27% of them look for foreigners to take as lovers.
34% Spainish women are looking for someone older than themselves, while in Mexico, 28% are married women of 20-25 looking for an affair.