Some choice quotes:
The porn industry is in crisis, its profits decimated by the impact of the illegal downloading of pirated content from YouTube-style sites and also amateurs uploading their own sex scenes on paid-for sites.
Fifteen years ago, when I did my first reporting on the porn business in Los Angeles, it was a very different picture. Back then, porn companies were making millions.
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Many female performers also work as prostitutes for extra cash. Where a female performer might make $600 to $800 (£388 to £518) for a straight sex scene in a movie, she can get double that - for less work - by "doing a private".
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Louis Theroux - Twilight of the Porn Stars is on BBC Two at 22:00 BST on Sunday 10 June
http://www.bbc.co.uk/news/magazine-18352421