My point is trackbacks are not gonna help you unless you do it en masse - and if you do do it en masse those links will be devalued. A bigger point is that at the end of the day, bending over backwards to please Google isn't going to win a blogger any brownie points. Build a blog for surfers - Google traffic is just cream on top. Lastly, if you want to build traffic off thousands of long tails publishing stuff no one is ever gonna bother reading, why not just buy a spam script? Even spending 30 minutes on chasing a low traffic long tail just for the sake of traffic to me is way too much work.
The real strength of a blog is what Karen said - getting organic links from sites like Fleshbot - sex blogs is probably the only "sector" in adult that's freely linking - and those are the type of links that will boost your rankings.