There are many sites like RubMaps but not exactly full analogues. Some escort listings are free for men visitors, such as BedPage and Escort Alligator. Others are rather forums not the ads galleries.
UsaSexGuide is one of them
As for the naughty massage parlors, no one lists them better than RubMaps. It is just specialized in Asian SPAs with special services and guaranteed happy ending.
To make a difference with RubMaps alternatives, one can also try adult dating apps and platforms for sex positive people. Those are Alt, Pure, Adult Search, AdultFriendFinder, and FetLife.