Feed aggregators are good for consistent traffic, provided you update regularly and don't mind syndicating your content.
http://www.rssxxxfeed.com/
http://www.xxxblogindex.com/
Regular blog directories that usually do good for me:
http://www.pornblograbbit.com/
http://www.adultsexblogs.com/
I'm sure it depends on what niche you're promoting, so results may vary.