Any /adv/enturers here that know a thing or two about relationships?

I'm afraid my girlfriend and I aren't very sexually compatible and after eight years I find it hard to deal with.
We have sex often enough, but long story short, I'm a bit of a pervert, I watch a ton of different kinds of porn, and my girlfriend is very one-track, she likes rough, kinda rapey sex.

I'd love to share the rest of my sexual interests with her, but she deems most things she doesn't like as too hard, too whorish, too weird or too gross.

How does one deal with that?