Webring.com:

Webring.com has 2,437 URLs listed in 1,316 Dmoz categories.

Slash Recommendations
A slash recommendations webring for all fandoms.
http://i.webring.com/hub?ring=slashrecs
Top/Adult/Arts/Online_Writing/Fiction/Fan_Fiction/Web_Rings/Slash

WebRing: Multiverse Slash Ring
Lists sites with stories in a variety of fandoms, including Buffy the Vampire Slayer, The Sentinel, and Highlander.
http://f.webring.com/hub?ring=multiverseslashr
Top/Adult/Arts/Online_Writing/Fiction/Fan_Fiction/Web_Rings/Slash

WebRing: Whispers of Eros
Directory of sites devoted to erotic literature and art.
http://j.webring.com/hub?ring=eros&id=190&hub
Top/Adult/Arts/Online_Writing/Web_Rings

WebRing: Just for Ladies
Lists sites that offer erotic fiction by women and for women.
http://p.webring.com/hub?ring=justforladies&id=1&hub
Top/Adult/Arts/Online_Writing/Web_Rings

WebRing: A Writer's Soul
Directory of sites offering various genres of erotica, including fiction and poetry.
http://l.webring.com/hub?ring=writerssoul&id=40&hub
Top/Adult/Arts/Online_Writing/Web_Rings

WebRing: Amateur Erotica
Directory of sites that offer stories written by non-professional authors.
http://g.webring.com/hub?ring=amateurerotica&id=35&hub
Top/Adult/Arts/Online_Writing/Web_Rings

WebRing: Erotically Speaking
Provides links to sites hosting erotic stories and discussion.
http://w.webring.com/hub?ring=eroticring&id=7&hub
Top/Adult/Arts/Online_Writing/Web_Rings

WebRing: Communique Erotique
Links to sites owned by erotic writers.
http://x.webring.com/hub?ring=communiqueerotiq&id=11&hub
Top/Adult/Arts/Online_Writing/Web_Rings

WebRing: Web Erotica
Directory of sites featuring erotic stories and art.
http://f.webring.com/hub?ring=weberotica&id=53&hub
Top/Adult/Arts/Online_Writing/Web_Rings

World Erotica
Erotic art from all over the globe. It doesn't matter if it's photography, painting, sketching, sculpting or cartoons.
http://x.webring.com/hub?ring=worlderotica&list
Top/Adult/Arts/Visual_Arts/Resources