The bandwidth usage of a pornography site is relatively high, and the income a free site can earn through advertising may not be sufficient to cover the costs of that bandwidth.
One recent entry into the free pornography website market are Thumbnail gallery post sites.
There are several forms of sites delivering adult content.
The most common form of adult content is a categorized list (more often it's a table) of small pictures (called "thumbnails") linked to galleries.
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