Eagle-eyed viewers of a current affairs programme were stunned to see the news suddenly turn into the NUDES.
Ed Miliband’s Labour leadership was being discussed on live TV when a background monitor started showing a naked woman having sex.
Some viewers north of the border witnessed the romp as Scotland Tonight host John MacKay interviewed internet blogger Dan Hodges, who was in the ITN studio in London.
Paul Traynor, who saw the steamy scene while watching at home, said: “Someone should explain why some irresponsible employee decided to watch porn while live on TV.”
The clip is thought to have been from Channel 4 show Shameless, which was on at the same time.
An insider said: “It's unfortunate but in a busy newsroom we have monitors showing all the various TV channels. You can only see the scene for a few seconds and the vast majority of viewers won't have even spotted it."
Scottish Television said: “We hope that viewers weren’t too distracted by the unexpected content.”