Hello, Snagglepuss!
I know some places that are useful for feeds/blogs promotion.
Here is a good tutorial for RSS feed and blogs promotion:
http://blogforfunandprofit.blogware.com/blog
Here is a list of places where you can submit your feed:
http://www.rss-specifications.com/rss-submission.htm. But please note, that not all of directories from this list allowing adult feeds.
Also, I have a category "Sex Blogs" in my linklist and you may submit your blog to it.