If it's feature length xxx iPhone movies you're after, and you plan on watching them often, then downloading them to your computer and transferring them to your iPhone using iTunes is the best way to do it.
This method is a little more time consuming to set up as you download each porn movie to your hard drive and take a minute to import it in to iTunes. the final step is to sync your iPhone.
The main benefits to using this method, rather than streaming the porn movies to your iPhone over wi-fi, EDGE or 3G are:
1. You always have a digital copy of the iPhone porn movie.
2. You can build a huge personal library of iPhone porn movies, and use iTunes to easily pick and choose which ones you want on your iPhone at any given time.
3. You can watch them even if you don't have wi-fi, EDGE or 3G access to the Internet.
More and more services are catering for iPhone users by making their videos/movies available in QuickTime, an iPhone/iTunes friendly format.
Should you opt for a porn service that hasn't taken the time to make the movies iPhone compatible in QuickTime, your iTunes software may convert downloaded video files to a friendly format and transfer them to your iPhone, but you'll need to check with them first.
Essentially, you just view the porn site using your Mac/PC, download/save the porn video to your hard drive and then sync it to your iPhone using iTunes.
