The latest motley crew to do the full monty is a group of peat cutters from the island of Lewis in the Outer Hebrides, who are hoping to raise money for Leukaemia Research. Jock Murray, who came up with the idea, told the BBC News website he had orders from Australia and planned to take a consignment of calendars on a trip to Las Vegas.
He said: "I couldn't care less if people think if I am mad or not. The problem when one retires is finding something to do."
But another nude charity calendar, featuring a fireman with only a jet of water to protect his modesty, has found itself in the soup.
A memo leaked to the Daily Post in north Wales warned that firefighters could face disciplinary action if they took part in charity stunts that perpetuated a laddish image of the fire service.
The calendar was published by the Froncysyllte Male Voice Choir to raise money for Help the Aged.
The offending image of a member of the North Wales Fire Service, who is also a Froncysyllte choir member, incurred the wrath of assistant chief fire officer Paul Claydon.
His memo said: "Images that perpetuate the 'Jack the lad' macho image of the traditional fireman are simply not acceptable."
Dave Jones, a prison officer who also appears in the calendar, said: "In every walk of life, you must have a sense of humour. That's all we're doing here - having a laugh."
Meanwhile, the London Evening Standard reported that a former employee of homelessness charity St Mungo's, who was sacked for refusing to remove her goldfish from the office after they had died and began to smell, has lost her claim for unfair dismissal. A tribunal in Croydon ruled that the sacking was fair.