That in itself a major reason she is a keeper! Women like her are pretty rare to find. Although seeing as though you want to leave her it seems like you've had your fair share and know of prospects that might be more anally obsessed as you are?
I feel that there's two components to a woman being an anal queen - there's the psychological component, the question of how much the very thought of anal turns them on, and how kinky they're willing to get with it, and then there's the physical component - do they experience pleasure, and not pain from anal? Is their rectum typically in shape for anal sex, or do they often take horrible diarrhea shits that wreck their asshole and leave a mess in there?
With my current GF, I find that it works out very well from the physical standpoint, and it's also awesome that she's almost always willing to do it. She also tells me it feels really good. But I also don't think it's a super big fetish from a psychological standpoint, and I think the big reason we do anal most of the time is because she knows it's "my thing."
I've dated other women for whom the psychological component is stronger - who get really turned on by the idea of things like rimming, A2M, etc. I went on one date with a girl who told me she A2Ms herself when she masturbates... but she had also only had anal sex a few times in her life, so who knows how well she would tolerate being fucked in the ass all the time.
You've found a gem, man!
It does seem so.
I'd be hard for me to be with someone long term who doesn't enjoy ATM. With how long you've been with her, she would be doing it by now if you've had other women do it without having to request it.
To be honest, as hot as the idea of A2M is to me, I find that in practice, it's not as nice as how hot it sounds in theory. The first time I did A2M with a girl, it was mildly disappointing. There's also the fact that in real-life anal sex, sometimes you encounter poop, and sometimes, if it's a small amount of poop, it's not immediately visible on your dick. I wouldn't wish eating poop on anybody.
I think there's a good chance I could get my GF to start doing A2M if I requested it, but frankly, I'm just so happy that we have anal sex all the time that I haven't wanted to tempt fate.
Haha to go into more detail, though (and maybe now you'll really think she's a keeper), one time, after I came in her ass, she sucked the jizz off the tip of my dick, unprompted. Rather than being really turned on, I actually felt horrified, because what she didn't realize was that the anal sex we just had was messy. But I don't think she got any shit in her mouth.
She also fingers my ass sometimes, and unhesitantly takes her finger out of my ass and puts it in her mouth to get more saliva on it. But this is more about the mechanics of getting the act done, not about craving the taste of the inside of my asshole. For what it's worth, she rims me, too, because she knows I like it, and I often rim her, but she says it doesn't really do much for her, other than that she knows I like doing it.
And now you'll all really think she's a keeper.
If you don't feel like in your heart you're getting enough anal and aren't as compatible with outside the bedroom, then perhaps you should take a risk, break it up with her and find out. There's plenty of other women who might be right for you.
I mean, it's working out pretty well for me, other than the difference in sex drives which we're trying our best to work around, and I might go through a job transition, in which case getting steady anal sex from a long-term girlfriend would be a good way to keep me focused, without dating sucking up all my energy. But ethics is a big factor in my decision to stay with her - I would just prefer not to be in a position where I'm wasting her time if I'm going to leave her anyway in the future for more experience or to find someone even more compatible.
But after reading all these comments, I'm tempted to stay. And who knows what might be in store for us over, say, the next year, and how my feelings for her might evolve.