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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 rise of pornography websites offering photos, video clips and streaming media including live webcam access allowed greater access to pornography.
This was possible in the late '80s and early '90s through the use of anonymous FTP servers and through the Gopher protocol.
At this time the internet was mainly an academic and military network and there was not widespread use of the internet.
Usenet newsgroups provided an early way of sharing images over the narrow bandwidth available in the early 1990s.
Because of the network restrictions of the time, images had to be encoded as ascii text and then broken into sections before being posted to the Alt.binaries of the usenet.