It seems that "Boys will be boys" is a well established idiom and, according to Cambridge Idioms Dictionary, 2nd ed, as it is written on The Free Dictionary, it is "something that you say which means it is not surprising when boys or men behave in a noisy, rude, or unpleasant way."
However, searching on Google Books I found plenty of books whose titles contain the phrase "Girls will be girls" and I found, too, a film named "Girls will be girls".
So I began to wonder if "Girls will be girls" is a phrase that begins to take on an idiomatic meaning in English. Is it so?
If yes, in what circumstances do Americans or Brits use it? And, what do they want to say when they use it?