Redlight Virtual Community

Moo's
MediaMOO - head for the warehouse to find the Redlight.
PostModern Culture (PMC2) - check out the rhizomes.
LambdaMOO (the original) at Xerox Park.
OutlawMOO (just like it says;)
See also these Locals
The Degenerate Press
Media Maniacs

and A History of MUDs