Check our list of sites:
http://www.adult-trades.com/instant-trades.htm
Most of them has an automated script, just put the linkback and submit your link. The maximum number of spots is limited (these are not "linkdumps").
Please, read the rules - all links that does not comply with the rules will be removed without notice!
For bulk, category or "unusual" trades contact us by e-mail (below that page)