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On the Web, there are both commercial and free pornography sites.
At this time the internet was mainly an academic and military network and there was not widespread use of the internet.
When a user purchases a subscription to a commercial site after clicking through from a free thumbnail gallery site, the commercial site makes a payment to the owner of the free site.
There are several forms of sites delivering adult content.
The invention of the World Wide Web spurred both commercial and non-commercial distribution of pornography.
The rise of pornography websites offering photos, video clips and streaming media including live webcam access allowed greater access to pornography.