The message of the advertisement is obvious - iRiver is promoting their gadget for the purpose of viewing hardcore pornography in public places.
They are promoting though to people who probably don't need any prodding. It doesn't say, as best as I can tell,"Jenna Jameson says watch porn in public on an iRiver device and all your fantasies will come true."
I don't know about this particular device but I recently saw a portable dvd player that stored 40 dvds on its hard drive. Now that is something I wouldn't mind having. All of my CDs were scratched up from carrying them around in a case to listen to them. This way that wouldn't happen to my DVDs.