You can tell how much people as a whole are generally interested in something by finding how frequently it occurs in the internet. The following are google searches... Note that I've somewhat mangled them so it doesnt look like my site is dirty spam.
Although there's a lot to the internet and we can get many random search results from searching educational related themes, the search results are skewed because of the limitations of columnists and honest bloggers making their writings G-rated. From a services perspective, many articles go unread and viewed, they're just crawled. However, people download a ton of pr0n, way more than they bother spending time reading online.
It's true, the majority of the internet is for pr0n, not good intentions and productive, scholarly work. A good example is the scholarly source wikipedia, which everyone should use. It's used by millions of people, but nothing compared to people downloading dirty stuff.
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