I like the simplicity of your idea. However, there's articles on porn that are non-pornographic in nature. Usually people discussing or discouraging it rather t

I like the simplicity of your idea. However, there's articles on porn that are non-pornographic in nature. Usually people discussing or discouraging it rather than using it. To account for that, maybe make it something like "showporn" or a dedicated search page for it. Then, people Googling for information on porn that's not pornographic still wont get hit with it. Whereas, people looking for it using dedicated search page will exclusively see it. This isnt that different from search engines for specialized databases. I used to use meta-search engines that woukd have checkboxes or selection menus to focus search on specific topics or collections. It was very useful. I still do it for technical papers using the "site:" operator to limit search to known-good sites for them.