I have a niche adult site for sale - actually includes 3 domains, which 2 act as feeders to the main one. The main site (Shemale Express) has been around since 1997, catering to the transsexual / shemale fetish niche. Details can about the sale can be found by clicking on the link below:
Sale Details
If you have any questions or bids, fire away. I have had a few offers (from people seeing the onsite For Sale notice) since I put the site up for sale: the top 3 bids (in numerical order, and not the order in which they were received) were $3500, $4000, and $4400 (which rounded to 2500 British Pounds as they were located in the UK). I reduced the asking price to $5,000.