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.
There was a rapid growth in the number of posts in the early 1990s but image quality was restricted by the size of files that could be posted.
Internet pornography is any pornography that is accessible over the Internet, primarily via websites, peer-to-peer file sharing, or Usenet newsgroups.
The availability of widespread public access to the World Wide Web in late 1990s led to the growth of Internet pornography.
On the Web, there are both commercial and free pornography sites.
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.
Children born in the 1980s onward are also the first to grow up in a world where they have access to the Internet beginning in their teenage years, and this early exposure and access to Internet pornography may be the primary driver of the increase.