Butthole attractiveness is a new dimension of attractiveness that we aren't being measured on yet. There are generally attractive people going around with an ugly butthole and generally ugly people going around with one that should be immortalized.

I suppose that all depends on your personal standards for beauty on both ends of the equation.

Yes. Features compliment each other. Someone with an attractive face is likely to have enchanting eyes for example.

So, attractive means a different thing to every single one of us. That said I will speak on my own tastes, which are admittedly kinda broad. I have found both more and less attractive anuses, much like similarly describable vulvae, are fairly equally distributed among women of just about every shape and size. Proportionality is in no way consistent, neither is appearance. Most are beautiful in their own way and I have been thankful for nearly every one of either that I have been granted access to. Some are definitely "better" than others, though I am certain that this is more a matter of preference than anything quantifiable.

No, I'm very pretty with a shapely cyclist's ass but have very painful hemorrhoids.

I'm not very attractive, but my butthole is very good.

Go outside and touch the grass

This is like asking if attractive people have better mouths. Not necessarily. This depends on how you weigh the feature in question in the overall math for "attractiveness", I wouldn't say there is a direct correlation just based on looks but if you take attractiveness as a health marker then the buttholes will be likely healthier in more attractive people on average. You would always have outliers though.

They're like fingerprints.