I have 3 art galleries that are all pretty popular:
http://www.sexyamazons.com
http://www.darkcomix.com
http://www.deadlyamazons.com
The top two are pretty extreme but the last one is mild with catfights, dominant women etc. My top referer program will automatically pick up any hits coming in and post your site on our first page. It's not difficult to get posted right now since not that many people link to the sites.
Some stats on DeadlyAmazons.com (least visited gallery)
630 average visits per day
11,000 average Pages per day
121,000 average Hits per day
4.8G Bandwidth per day
316,247 Alexa Rating
PR 2