The safari browser that's already installed on your iPod Touch can view most types of images on the internet.

A new feature introduced with the latest version of the safari browser on your iPod Touch is the ability to save images to your 'Photo' Album. Just hold your finger on the image for a few seconds and you'll get the option to 'save image'.

NOTE: The iPod Touch CANNOT currently view Macromedia Flash or Shockwave. So you have to be sure that the porn sites you use provides content in other formats.