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One of the early Gopher/FTP sites was at tudelft and was called the Digital Archive on the 17th Floor (List of websites founded before 1995).This small image archive contained some low quality scanned pornographic images that were initially available to anyone anonymously, but the site soon became restricted to Netherlands only access.
This type of distribution was generally free (apart from fees for Internet access), and provided a great deal of anonymity.
The anonymity made it safe and easy to ignore copyright restrictions, as well as protecting the identity of uploaders and downloaders.
A linklist is a (frequently) categorised web list of links to so called "freesites*", but unlike TGPs, links are provided in a form of text, not thumbs.
It's still a question which form is more descriptive to a surfer, but many webmasters cite a trend that thumbs are much more productive, and simplify searching.
On the Web, there are both commercial and free pornography sites.