Gyrating wildly in the great outdoors, an energetic team of unidentified naked beefcakes has startled a Norwegian city by having rampant sex with some of its most famous sites.

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In a series of YouTube videos, the hormonal humpers take on Trondheim with such a vibrant display of orgiastic love-making that no viewer can be left unmoved.

But not everybody in the stunning old city appreciates the three videos that have so far emerged from the anonymous bonkers.

The city’s foremost educational institute, the Norwegian University of Science and Technology (NTNU), took exception to the fact that the filmmakers included its logo and slogan in a video of muscular young men simulating sex on the snowy steps of the university’s main building.

“It goes without saying that we wouldn’t have given our approval if they had come and asked our permission to make this kind of video,” NTNU spokesman Christian Fossen told the university newspaper, Under Dusken.

Guessing the amorous gents were students at the college, NTNU requested that they at least remove the logo, which they subsequently did.

Once viewers have watched the first video, the plot-lines in the later clips take on an air of remarkable familiarity.

In the second film, a young man walks up to Kristiansen Fortress against a backdrop of relaxing birdsong. But once the ominous techno soundtrack kicks in, the grounds of the fort are quickly occupied by throngs of pelvic thrusters.

The final flick, posted just four days ago, casts a quaint old bridge as the unsuspecting victim. Crouching, standing, and even climbing, the men turn a landmark known locally as the “gate of joy” into an infernal scene of base depravity.  

But regardless of moral considerations, Christian Fossen also slammed the level of film-making involved.

“The films are incredibly poorly produced from a cinematic perspective and in terms of quality. It’s a very low form of humour and artistic expression,” he said.

But with the director and crew as yet unidentified, Trondheim may not have seen the last of these virulent vagabonds.

Update: Newspaper Dagbladet on Thursday caught up with "Onkel Saft", the person who posted the videos to YouTube. Keeping his real identity secret, he sought to explain the recent spate of outdoor sexual activity.

“The idea behind this is to create renewed awareness of the beautiful sights in Trondheim. We are very fond of the city of Trondheim, as you can probably tell.”

A fourth video has also been added to the canon (see below).