The old saying "One man's garbage is another man's art" comes to mind.
Honestly, who gets to tell you what is or is not disgusting so long as you are not forcing another to do it? Honestly, when you get down to sex in general, and if you look at it from an outsider's point of view, PIV is not exactly pretty.
Along another line, anal sex has been prevelent in virtually every society dating into prehistory. We have art to thank for the evidence. We also have lots of Greek and Roman writings. Yeah, they ass fucked a lot.
Finally, to answer your question about what sort of woman allows a man to fuck her ass...my woman does. She is a smart, sweet, loving and tender girl. A great mother. And, yeah, we are AO at her request.