I say that they both go to an adult store and pick out porn that they can both watch. It could be a fun experience they'll both enjoy and may help her open up towards the idea of porn.

Also, rather than using pictures of just his gf maybe they should make a home made video of them selves together. I've always thought of home made porn as being far more appealing than just pictures. It may give him more incentive to use the video rather than the pictures since it includes more "porn" elements, like two people, motion and penetration (should they choose to be that candid, which I highly recommend).

Personally me and the wife like watching porn together. Its a good way to get ideas and get the juices flowing.. sort to speak.