Hotel Pornostein is a mod for shareware Wolfenstein, made by Mr. Choi. It was finished in February 2003 and was available on his own website for a time.
When Hotel Romanstein was released in August 2004, Brian Lowe mentioned that he had received this add-on but was cautious about its release due to its X-rated appearance. It was however hosted under the name porstn.zip on February 22, 2003.
The mod is essentially an early version of Hotel Romanstein, featuring the same levels, but full-on nudity is featured here in both enemies (the dog has been replaced by a naked woman with a whip) and textures (including anal intercourse and closeups of breasts). These were removed or replaced for Hotel Romanstein.