Pornography is in the top five of industries buying state of the art computer equipment. According to Forrester Research, the only industry analyst that tracks the adult Web market, pornography accounted for $137 million in US Web revenue in 1997, and should reach $185m this year and then double to $366m by 2001. Pornography is the third biggest Web earner, after computers (for hardware and software purchases) and travel (for tickets).
Free adult entertainment website are operated free of charge on the internet. They are often free of advertising and the content may be provided live by volunteers.