A cricket journalist has been caught watching hardcore porn while reporting on a Test match.

The Guardian's deputy sports editor Russell Jackson revealed in a blog post that he witnessed the unnamed journalist watching the X-rated action on his laptop during the Boxing Day Test match between Australia and West Indies.

"Last week in the Melbourne Cricket Ground press box I was staggered to note, on the third morning of the Test and for the entire day thereafter, an accredited member of the media sitting in front of me tapping away at his company laptop, but tabbing between his match report and a constant stream of hardcore pornography," Jackson wrote.

"I could barely believe what I was seeing. The thing that initially staggered me was the sheer audacity of it, that the presence of both female and male colleagues, who were sitting metres away with clear views of his screen, hadn't been enough to deter him and that he felt perfectly comfortable doing it in full view. Welcome to Blokesworld.

"Personally, I don't subscribe to every arcane and unspoken law of the press box, but find the one that precludes any of us from spending eight hours on the verge of public masturbation is generally observed by all."

Jackson added that the journalist was eventually approached by a press officer and asked to cease his activities.