XXX-WOLF is a mod for shareware Wolfenstein v1.0. Authorship is unknown.
Most likely the earliest Wolfenstein 3D modification (being released six days after initial release) known, it consists of - surprisingly - a few new graphics, all X-rated. A Read Me is attached, but alas no author name is given.
The set was located by His Duckiness in one of his many grueling hunts to find the many mods beyond.