To be clear: to each their own. I respect everyone’s view so this is in no way more than an opinion 
As we are a very versatile group of people, I feel like this can be a good way to understand one and other more.
Being anal only, to me, means something else then to others. So here are the things I would never give up or do:
Never would I give up having my cock sucked. In a way it’s even more important to me than assfucking.
I will never want my asshole to be penetrated. I’m 100% a top and have not even the slightest urge to have my asshole penetrated.
I am not able to do real dirty talk. Like even while I sometimes think of my wife as my ass to mouth slut, I will not say it out loud cause it feels wrong to call her slut. Loving anal sex so much doesn’t make her an anal slut. Cause the slut part would imply the just want any cock up her ass.
I would also absolutly never give up using my cock. It’s very important to me that my wife loves my cock so much. It made me love it more too. I need to shove it up her asshole or down her troat. It means the world to me.
So this makes me pretty meanstream I guess. But I get that there are as many prefferences as there are people. So what’s your list of things you’d never do in your sexlife ?