I don't know where they got the word 'bay' from, oh no - actually I do! It's from The Pirate Bay, and just like that infamous torrent website, this is a place to go if you want to get your hands on pirated material from the classic peer to peer process of accessing adult entertainment.
Now I'm not one to support getting porn without paying for it - especially when the content is behind a paywall - but I'm going to assume good faith and just say that I hope anyone downloading porn via torrents is doing so because it's easier than logging into the website and getting the scenes that way (of course, you have an account, you just prefer to do it via P2P).
Porn Bay does require you to register and log in for access to the files, but like most private trackers, it's incredibly good at providing you with the latest high quality porn scenes from all over the Internet. It's been around for a few years now too, so that's gotta be a good sign, right?