Mike,

In the adult site world what they call freesites or free sites are what we call mini sites. There are many hundreds of thousands of them, run by people who know how to optimize for the SEs.

Adult webmasters have two main ways of getting traffic: search engines and trading traffic amongst themselves. They can't relentlessly post messages on forums that include their link at the end. They can't buy ads. They can't submit articles to ezines.

If they couldn't bring in new search engine traffic all the adult sites on the web would wither and die. I could explain the math behind how they make it work, but I'd rather not.

Hope this helps,

- Boyd