* Dubbed ‘Blue Monday for relationships’, the 5th January marks the day most people turn to infidelity after festive tensions expose cracks in their relationships.
* New registrations on IllicitEncounters.com are forecast to rise by 38% by the end of this week, prompting the site to bring in additional staff for the second consecutive year to cope with demand.
* 71% say ending an unhappy relationship is a top priority this year, while 56% admit having more sex is high on their 2026 to-do list.
As the decorations come down and reality bites, today is the day more Brits will choose to pursue an affair than any other day of the year, according to relationship experts – and it’s all driven by post-holiday blues and a desire for a fresh start.
The 5th January has been dubbed ‘Blue Monday for relationships’ – sharing the spotlight with Divorce Day, as both land on the first working Monday of the year.
According to new data from IllicitEncounters.com, registrations are forecast to be 38% higher by the end of this week, making this one of the site’s busiest starts to a year on record. The surge has been so significant that additional customer support staff have been drafted in for the second consecutive year to manage the influx of new members seeking an affair..
The site also surveyed 1,000 members who joined during the first few days of January, revealing the emotional drivers behind the spike. A striking 64% said the festive period made them realise how unhappy they were in their relationship, while 49% admitted that spending extended time with their partner over Christmas confirmed feelings they had been trying to ignore.
When asked about their priorities for the year ahead, 71% said leaving an unhappy relationship or starting divorce proceedings was at the top of their list, followed closely by having more sex (56%), feeling desired again (51%), and putting their own happiness first (47%).
One woman who joined the site this week, Sarah*, 39, from Leeds, says Christmas was the final straw. “On paper, we had a perfect Christmas – family visits, big dinners, presents – but I felt completely invisible the entire time,” she says. “We barely spoke unless it was about logistics. When January arrived, I realised I couldn’t go into another year feeling this lonely. Signing up felt like taking control again.”
Jessica Leoni, sex and relationships expert for IllicitEncounters.com, says the timing is no coincidence. “The festive chaos is over, routines return, and people suddenly have space to act. That combination of clarity, dissatisfaction and opportunity makes early January the most dangerous period of the year for struggling relationships.
The post-Christmas surge in activity on IllicitEncounters has become so consistent that, for the second consecutive year, we’ve needed additional staff to manage the influx of new members. It underlines just how significant early January has become in the relationship calendar.”
“Christmas has a way of magnifying everything that isn’t working in a relationship,” she explains. “There’s pressure to be happy, affectionate and grateful — and when the reality doesn’t match the picture, it can be deeply confronting. By early January, people are emotionally exhausted and far more honest with themselves about what they’re missing.”
She adds: “January represents a psychological reset. For some, that means diets or gym memberships — but for others, it’s about reclaiming intimacy, excitement and feeling wanted again.”
*Name has been changed.
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