UK centric adult social network:
http://www.be-seen-here.co.uk/
Has a maximum of ten 150 x 110 thumbed slots (linking to anywhere you like) available on it's entrance page and also the network core:
http://www.be-seen-here.co.uk/adult-social/
50 GBP or $100 for 1 year. Please email
[email protected] with questions/payment options.
Even if you don't buy you are welcome to join and promote your sites.