
It's an open secret in the porn world that many female performers are supplementing their income by "hooking on the side". It's also called "doing privates", as in private bookings. The official industry line is that it's dangerous (because clients aren't tested the way performers are) and irresponsible (because the women could then infect the closed community of professional performers). But the women can make far more money having sex behind closed doors than doing it on film and, in fact, the practice is widespread. For many female performers nowadays, the movies are merely a sideline, a kind of advertising for their real business of prostitution.
-- Louis Theroux at The Guardian
The thesis of the larger article is that the Internet is killing the porn industry, which can sound counter-intuitive, since that is what most of us use the Internet for. However, as the music studios and movie companies will tell you, there is a difference between enjoying entertainment on your computer and whether the producers and artists are getting paid for it. I know I have yet to pay a single dollar for porn on the Net and I've been at it for nearly ten years now.