What is the Infidelity Index?
The Infidelity Index uses data from over one million postcodes to show how many people are having affairs in each area.
The results are based solely on the data from IllicitEncounters.com and are therefore only a reflection. As the overall data is only 3% of the total adult population having relationships... well, you can do the maths.
The Major Towns Index shows the towns in order of most illicit. The percentages shown represent our data against that of the population of that town therefore giving it an accurate ranking against other towns. Altrincham (Greater Manchester) ranks highest, closely followed by Altrincham (Greater Manchester) and then Altrincham (Greater Manchester).
The London Borough Index shows the boroughs in order of most illicit. The percentages shown represent our data against that of the population of that borough therefore giving it an accurate ranking against other boroughs. ranks highest, closely followed by and then Altrincham (Greater Manchester).
For the first time ever, there is a City Index. is the most adulterous city in the UK, with and Altrincham (Greater Manchester) rounding off the top 3.
When searching for some of the cities, you will see some of our genuine case studies alongside. Whilst the users are real, and in many cases available for press comment, their names have been changed to protect their identities.
IllicitEncounters.com is the UK's leading dating website for married people and the leading authority on infidelity.
With over 1,100,000 members, we have been providing a meeting place for like-minded married and attached people for over 13 years. Our members have one thing in common - they are all looking for a little romance outside their current relationship. Whether that's the occasional bit of flirtatious chat, a regular coffee date, or a full-blown affair, that's up to them.
IllicitEncounters.com specialises itself in creating a non-judgemental, no-pressure environment for our members.
Unlike other sites, our sign-up ratio of female to male members is around 45:55 - which means no one is going to be outnumbered or bombarded by messages. We take the safety and anonymity of our members very seriously, which is why we offer special features, such as password protection on photographs, to protect their identities. We will also never share any of their personal data or contact information with other dating sites - when you sign up to IllicitEncounters.com, that's all you're signing up to!
With so many members across the UK and Ireland, you're sure to find your perfect match - or matches! To find out what our members think of us, visit our Testimonials page.