Some places where the slashing is good...  Sadly, many more sites have disappeared over the years, and of those that remain, the vast majority are not updated anymore.  None the less, here are some of my personal favorites.

Italian Whispers

Siamese Twins

love.less 

A Strange Day

Bloodflowers

Mystery Science Cure Theater 3000

love set fire

The Upstairs Room

Banafishbones

Curasia

Goth - And Yet Not

 

Looking for sites that are a little more active?  Try one the fan fiction hosting sites.  

fanfics.org

fandomination.net

adultfanfiction.net

rockfic.com

 

I am always looking for more links, or new sites, so if you have one, or know of one, please tell me about it! Send me an email.