Originally Posted by Tent Pitcher

That is a good observation and question. Going back to what I said in an earlier response, mainstream sites just aren't run the way that adult sites are. Natural linking is simply the organic connection of sites - if someone wants to share something with their friends, they link to it - and - if a particular blog post or news article is popular, then it gets shared more often than one that isn't. You can't spoof it, you can't game it, you have to take it into account when working up an SEO strategy.

Building an organic adult site can be very hard for a couple of reasons. First, noise - there are a ton, literally millions, of adult sites out there. Second, the road most traveled is paved with affiliate links, redirects, bought and traded traffic, etc. The problem isn't that the search engines don't see this, it is that your average user doesn't. Your site may never get visited because all of your potential visitors are stuck clicking through redirects to affiliates, closing pop-unders, etc. You can maybe make some money on clicks that way, but you will never build a dedicated user base or a brand peddling someone else's wares.

In case it wasn't obvious, I am a firm believer in the notion that offering unique and quality content will net you the best results over time (assuming it is worthy of being consumed).