I just found this site, so don't have any specific videos to point you to, but you need "seduce" her as you introduce her to porn.
Start with some soft videos to get her warmed up. Girls dancing, maybe girl/guy dancing, sexy stuff.
Move on to homemade videos of couples making out and moving on to giving each other oral before moving on to fucking (no anal unless you are already doing that with your gf). The two of you should now be starting to make out, but make sure you take it slowly. You don't want to get so involved with each other that you stop watching the porn yet.
At this point, watch some videos of things you want her to try and make sure it is pleasurable in the videos, not painful. It might be lesbian seduction, anal, bdsm, or whatever, but stick with just one or two themes. Guide her to these activities and if there's one she really doesn't want to try just move on to another. Be sure to pleasure her too.
Finally, try and convince her to let you make a video of the two of you so you can upload it here :)
