Free Web Hosting
Companies that offer free adult web hosting. In order to "pay" for their services, they usually reserve the top and/or bottom of each page for their advertisements. Can be a good solution for new webmasters to start out. Not good for long term businesses.

Premium Web Hosting
Hosting services from companies willing to host adult orientated sites. There are 3 different ways of hosting: virtual accounts ( your site(s) on a shared server), dedicated hosting (your own dedicated server to host your site(s) on), and co-location (you provide the server, and the host connects it to a high-bandwidth pipe).