You cant just forget about sex. Anal if she doesnt want it you have to respect that. Sadly. But sex generally i think needs to be good. You must have the balance wrong so is not clicking right. My first marriage i had sex once every 3 months. Simply just not enough for me. Pleased to be out of that and in a relationship where we are more equal sexually.
OK, if you don't have the audacity to kick her to the curb, you need to respect her aversion to anal sex and never ask about it again, since she is in the driver's seat and in complete command of the relationship. While she's in command, give her everything she wants at your expense, marry her and after she cheats on you because she does not feel "validated," give her half of your shit by way of community property--on second thought, give in to her suggestion and prove you are indeed a true gentelman by giving her over 90% of your assets. She can then move on to the next cuckold and steal more resources from him. Not only would you be so angry when you realize you were so stupid for being so accommodating, you would be further angry when you realize that she knew that way before you did. This would drive a man to suicide. The Backdoor Man's approach is the simpler solution: ditch her and move on to the next girl who may love anal sex. Don't believe in the romantic notion that there is one and only one--get out of that frame of mind, you hear? The truth is that there are far more than you think who would be a good match for you. Sure, some bitches may be insulted at such a suggestion, but to hell with them because they are downright selfish. Don't be a fucking doormat, and don't embarrass yourself by making the wrong decision to stay for the wrong reasons. You should have seen this way before you started this thread.
I can't help wondering how many times BDM has been ditched with that kind of attitude. Come to that, it wouldn't even surprise me if he's still a virgin, living a fantasy of what a healthy sex life should be all about.
If this is the most important part of your relationship with her, and it is not working, then yes you should break up.