Fetish Auctioneer
Items divided into categories with thumbnail pictures where appropriate.

HiddenAuctions.com
An explanation of how to get access to the 'Mature Audiences' section of the mainstream site EBay.

KinkyBids
Goods divided into categories. Chat, postcards and a forum for questions.

NaughtyBids.com
Categorised items and sections such as 'Almost Gone', 'Just Added' and 'Most Viewed'.

Porn Auction UK
Products offered with thumbnails and split into categories such as clothing and videos. Forum for questions.