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Firefighters today warned the release of the Fifty Shades of Grey film could cause a spike in callouts from over-zealous lovers having bondage mishaps.

The London Fire Brigade said it is called at least once every day to "compromising" situations - including stubborn penis rings and a man with his genitals stuck in a vacuum cleaner.

In one instance in November last year the brigade was called by doctors to King's College Hospital to help remove two steel rings which had been stuck on his penis for three days.

Firefighters were eventually able to remove them using hydraulic cutting equipment after the unfortunate incident.

Fans of the erotic book and film Fifty Shades of Grey have now been warned to exercise common sense when indulging their fantasies amid fears emergency services could be tied up tackling the problems when the big-screen adaptation is released on Friday.

Dave Brown, Third Officer of the London Fire Brigade, said: "The Fifty Shades effect seems to spike handcuff incidents so we hope film goers will use common sense and avoid leaving themselves red faced.

"I'd like to remind everyone that 999 is an emergency number and should only be used as such. If there's a genuine emergency, fire crews will of course attend and will be on the scene to help within minutes."

The brigade said it has seen an increase in the number of callouts involving people trapped or stuck in everyday items since the Fifty Shades book was released in 2011.

There were 472 cases of people being trapped or stuck, often in household items, in 2013/14.

Since April 2013, crews in London have been called to 28 incidents of people being trapped in handcuffs.And firefighters have removed seven rings which had become stuck on men's penises in the past three years, the LFB said.

A spokesman added: "Our advice is simple. If the ring doesn't fit, don't force it on. As well as being painful, you could end up wasting emergency service time if you have to call us out."