Originally Posted by Vox

Here's some sites that lists them
http://www.top-blogs.com/adultsonly.shtml
http://www.globeofblogs.com/?x=topic&topic=383
http://www.blogarama.com/index.php?PID=25

Originally Posted by JizBiz

There is blog directories, blog search engines and also blog toplists. Almost all of them list adult categories.

Also rss/xml feed search sites will list them. Maybe you need to set a directory.