My SO had an extremely abusive past as well... I think the worst thing that I ever heard was her saying that something I had done 'triggered' her. It was horrible knowing that I might have caused my SO that kind of anguish.
As bad as it was for us to work though, it sounds like your situation is quite a bit worse there. Sorry man. However, it also sounds like you have a chance to help your SO turn her life around and that you're doing just that.
I know it's hard (no pun intended), but if you want to really be there for her you need to stick it out to the end with not being pushy about sex, or anything sex related. She will most likely be overly sensitive and easily triggered while she is recovering. Things that used to be playful and fun might be completely off-limits now, even if they're not sex-related in your mind.
One thing that you can do that most likely no one has done for her before - show her what it's like to have intimacy without the intention of sex. This may be hard to get through to her the first time as she might have it in her head that, hey, you're a man, and you have needs, and if you're doing something nice for her you might be trying to get some. That can be a pretty hard shell to break, but if you do you'll be able to show her that you truly care about her. It's about taking care of her needs first (after all, dealing with a sexually abusive past is slightly harder to deal with than not getting any), no matter how long it takes.
If you do make it through it, you'll both find a new level of intimacy on the other end and things will be much, much better than they were in the past, including the sex
.
Oh, and just as personal opinion, I would stay away from the home-made porn (especially if she knows you're watching it!). For me atleast, it seems like watching that would just make it things worse, being a constant reminder of the fact that the sex-life is non-existant for the time being. Theres plenty of porn out there to keep a man entertained eh?