From my experience making a blog a subdomain (blog.mainsite.com) is the least effective, it seems that playing with the www isn't appreciated by SEs.
If you make it its own domain name it also doesn't seem to benefit as much as it could. Seems weblogs are defined, somehow, differently than regular sites.
The best experience I've had as far as search engines (blog search and plain old search) is to have the subset: domain.com/blog seems to work the best.
It's as if the blog is defined somewhere more as a companion to a mainsite, and has to "know its place", and somewhere in the configuration of user agents and blog aggregators there is a definition of what is a blog and what is a site.
And unless you want to make RSS feeds with dynamic codes for affiliates, you don't have to worry about your RSS as long as you have a blog software that generates xml feeds and you have a link to the xml on your index page.
Some sites that use xml content will crawl your site all on their own. Some you have to submit to. Just make it a text/css link button instead of a graphic link.
sites like
http://www.babefriends.net/
http://www.adultblogfinder.com/
http://www.bloglines.com/ (not sure how they take adult anymore)
seem to go fishing for rss feeds; but you're always surer to be found if you submit manually heheh.
OR if you submit and get listed at places like
http://www.sbloggy.com/
http://www.adultblogdirectory.com/
etc.
You won't get as many hits but your link will get parsed by sites with spiders.
This is a neat one, too:
http://www.freesmutclub.com/browse (manual submit though one blog they listed I don't remember adding, so ...)
A great place to kick-start your blogroll, to get your blog on online aggregators and get indexed, is
http://www.tradeadult.com/#blogs - which has all the recips pre-coded ready for you to copy-paste to your sidebar for submission readiness in list or raw code format.
Another thing is the tags or labels - make sure your blog software is able to generate those; if your blog entries are text-rich and keyworded well, the labels or tags make it even easier for you to be indexed high, particularly in blog search engines, and indexed by categories, niche, acts or action.
You can even submit to non-adult blog and rss listing places, such as Technorati, as long as your images aren't too explicit (they can link to explicit stuff, just not contain it).
Let me know when you're ready we can do some link trades
.