VOD stands for Video on Demand, and those paysites are indeed in demand. While similar to DVD archive sites in that you are able to view a lot of different full length movies, they differ in some significant ways.First and foremost, VOD content is online streaming, which means you don't have to wait for downloads. You prepay for a certain amount of Video on Demand minutes, and you're able to fast forward to the hardcore action you're looking for meaning no membership cost. A good idea for less regular porn viewers.Another perk to VOD sites is that the movies shown are often brand new releases, so if it's important to see some of the latest porn movies, VOD is your better choice. On the downside you can't keep the videos on your computer.