this is about supporting cancer charities, seeing as that is the story.
one of the ladies husband died and the Women's Institute ladies got together to do a calender to raise money for charity, it's been a while since i watched the film. But sure that pretty much it. What is so surprising about that, how about the blokes who happily get their kecks off in productions of Chippendales, and the Fully Monty.
Their is nothing exploitative about Calender Girls, they are not by definition girls, but mature women, who are like the fun runners in the London Marathon, doing it because they care.