Technically, there is a limit to how much porn you can download at Unlimited Pass. However, given how much of it is available, it would take some effort to hit that limit and get through it all. Nevertheless, if you have been to Long Movie Downloads, then you are already on your way there since they are the exact same site.
There is only one difference. While LongMovieDownloads only has screen caps to go along with each video, UnlimitedPass has a large picture section with about 4,000 sets of high-quality (many high-def) photos. Videos are the star of the show and on that note both sites are exactly the same with 6,028 available and daily updates. Video quality is great for the full-length MPEGs, good for the iPod version and mediocre to average for the Windows Media clips. As with Long Movie Downloads though, the Unlimited Pass price tag is too high and, along with the non-exclusivity, where the site really loses points.