All Access porn sites are the main network sites which allow you to access every single site in their network with the same login and password. You can join any of these sites and get access to multiple porn sites for 1 price and 1 login. By joining a site that has an all access site you get the most value for your money. Some people also call these sites mega porn sites, because you get access to multiple porn niches so you will never be bored. Before joining any sites double check to see if they have a network site and if you get access to any of their bonus porn sites.