The map indicates that 13,336 people are having affairs in York - a rise of 29 per cent on last year when 10,350 people were cheating on their partners.
Affairs site IllicitEncounters.com, which has produced the map, said there has also been a surge in affairs activity with life returning to normal after two years blighted by Covid restrictions.
IllicitEncounters.com spokeswoman Jessica Leoni said: “We have seen a rise in affairs in York and throughout many parts of Yorkshire, though there have been some steep falls in some towns.
“The cost of living crisis has been a huge factor in boosting the numbers of affairs. Sex is one of the few things you can do which is free and is a good way to relieve stress.
“Fewer unhappy couples can afford to divorce because the cost of setting up two new homes is astronomical. Far cheaper to stay in an unhappy relationship and have a discreet affair.
“A second factor has been life finally returning to normal after Covid and cheaters making up for lost time after two years of restrictions.
“The run-up to Christmas is always a boom time for affairs because most people are back in the office and looking for some fun.”
'Marie', from York, said she had her first affair two years ago after joining IllicitEncounters and meeting someone straight away.
She said: "We got along really well and we went to some fantastic places and I often travelled with him on business trips. He introduced me to football and I even met some of his close family.
"I'm still seeing him now but I think we both feel that maybe it's time we parted. Having said he still calls me every single day and we often chat for hours. I adore being with him and he's certainly changed my life and the way I look at things.
"He's been my lover, friend and confidant. I don't want to finish things but feel its time. It never was for keeps.
"I still go on the site in an effort to find a replacement for when we do part. I've chatted to some men but my last relationship is a pretty hard act to follow. Although some men are nice and chat others can be a little shallow. You've got to learn to try not to take things too personal.
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