Google determines a page rank as the sum of the ranks of all the pages linking to it divided by the number of links on each of those pages. Your position can be improved with a few highly ranked incoming links. It can also be improved if a bazillion sites link to yours. Since pr0n sites don't accumulate links from CNN or the New York Times, they try to increase standing with thousands of incoming links. Pr0n0graphers create link slums, a series of cheap sites whose only purpose it to link to sites that sell instructional reproductive videos. But Google has gotten wise to this. It now deducts points if you link to a slum. This reduces the effectiveness of slums as rankings boosters.

Since link slums have lost effectiveness, pr0n0graphers now take a proactive approach to linking their sites from the sites of others. One approach is locate dynamic referer pages and bombard the site with bogus referer information. Blog Day Afternoon has such a page. (To view it, click "stats" in the yellow bar above.) In the past few months, the number of pr0n referers has sky-rocketed. I just eliminated voyeurism-stories.com, mature--sex.com, pee--pics.com and a boatload of ghey teen references. To combat this surge in pr0n0grahpic vandalism, I've amended my referer script. If the Referer contains a naughty word, it will not be added to the referer page.