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Red-faced McDonald’s bosses have apologised after serving up an X-rated side order of PORN to shocked burger lovers.

The fast-food restaurant set up video screens for customers that were programmed to show a sports channel.

But staff didn't realise that in the late evening the channel switched to broadcasting hardcore porn.

The blue broadcasts went on for some time in front of the fortunately all-adult clientele before staff in the Swiss branch of the burger joint noticed.

The incident occurred in Zuchwil, a town of about 8,600 in the Swiss canton of Solothurn.

Diner Steffen Reiniger, 24, went to the restaurant with some friends for hamburgers before going home.

And with their order of burgers they got a saucy side order of eye-popping episodes from the Sexy Sports Clips program aired by Sport 1, a German sports channel.

The porn film followed on from the usual sports fare for that evening

Steffen said: "We were only a group of men so it didn’t bother us, although I don't know what would have happened if there was a family in the restaurant at that time."

McDonald’s said employees were asked to leave the TVs turned to the Eurosport channel, but sometimes workers "change the channel to please a customer," McDonald’s spokeswoman Aglae Strachwitz revealed.

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She added: "If our employees didn’t immediately realise what was going on it’s because they were concentrating on our customers and their work."

In October an estate agent inadvertently broadcast porn from the window of its office in plush Notting Hill, London.

Faron Sutaria's outward-facing screen, which usually shows pictures of £1million-plus properties, was spotted featuring late-night adult TV channel Babestation.

Bosses said they believed someone had used a universal remote from outside to change the channel.