It seems his hard drive went into overdrive during one computer call out
The shocking video opens with the IT worker being called out to fix a woman's laptop - unbeknown to him she is an actress and the scenes are being observed by his blonde girlfriend on candid cam.
He arrives at her house and she opens the front door dressed in just a towel, claiming she has just stepped out of the shower.
The man, whose identity is hidden, is taken into the living room and seated on the sofa.
After fiddling with the actresses' laptop for a few moments, the brunette asks the man if he'd like to join her for a drink.
The man declines the drink while asking what the problem with her computer.
She replies: "I watch a lot of porn, it could be that."
The computer technician agrees, while sharing innuendos about her hard drive.
After the woman, who is dressed in a silky red dressing gown, tells the technician she is a dancer, she offers him a "private dance."
But while the man declines the offer, he does accept a drink.
As the video progresses, the actress asks the man if he'd like "to spend some time" with her.
Initially, the computer geek, seems reluctant and asks if she has a boyfriend.
After some awkward flirting, the man asks; "You're not going to tell anyone about this right?"
To which, the actress replied, "It will be our little secret."
The pair disappear off screen and the camera returns to his very angry girlfriend who shouts, "What the f***, did you let them have sex?"
The camera then focuses on the girlfriend's face as her boyfriend and the actress allegedly have sex.
She shouts: "An actual hooker? What the f***? He probably has STDs now.";
She then asks why they are still filming her before the video ends.
The clip has been viewed more than 1.7 million times since it was uploaded on 6 March 2017.
To Catch A Cheater have a history of catching out unfaithful blokes.
Recently, they caught a man giving his number to a porn star, while another man accepted a date from a flirty girl with a big bum while his girlfriend watched in horror.
