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A blue film, blue picture, or bf is a euphemistic term used in India, Israel, Nigeria, Sri Lanka for an adult film, often made by amateurs or shot in a style recalling amateur pornography. The term blue picture comes from Great Britain, where blue is euphemistically used to refer to works targeting the prurient interest or those that are considered offensive, obscene or in bad taste (blue laws, blue humour and a comedian's blue book are in this same tradition).
The blue film industry is worth a billion dollars, but public opinion about porn stars is widely negative. They are often considered sex workers rather than actors.