When we sort more than 20,000 porn sites by those that have the greatest composition of female visitors, "tube" sites and those containing graphic pictures tend to rank toward the bottom of the list. At the top of the list are literary erotica or sites that specialize in written erotic stories.

One of the most popular categories of literary erotic sites is adult fan fiction—think trashy novel meets Web 2.0. These sites, which run the gamut from straight sex to more kinky, fetish stories, are entirely populated by stories written by visitors to the website. The leading site in this category is, with visitors that are predominately 18- to 24-year-old women.

On visiting the site, you'll notice that content ranges from complete erotic novels written by users to sexed-up versions of existing stories, such as Stephenie Meyer's Twilight series. There is even erotic fiction based on J.K. Rowling's Harry Potter series.

In writing this post, I may have spent too much time reviewing content for this article. But with the surge in popularity in the written form of online adult content, if my wife asks, I can honestly say that I've been visiting these sites for the articles.

Bill Tancer is an Internet trend analyst, columnist and author of the New York Times best-seller Click—What Millions Do Online and Why It Matters.


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