In the early era of adult gaming, players typically interacted with standalone Flash games. These were often short, repetitive, and plagued by intrusive advertising. The emergence of "collections" or compressed archives (like .rar files) signaled a move toward

If you want your collection to be and RAR-based :

The best .rar packages are neatly organized into folders by release year, genre, or developer, complete with titles and box art rather than randomized file names.