A nice ass is usually tied to shapely hips... which are a good indicator she's a breeder. Same concept as bigger boobs on a chick, I suppose.What is the obsession with straight men and women's asses? It's not like you are going to fuck it that much, even if the chick let's you. And most won't. If you aren't going to fuck it or play with or in it, what's the point of being into it?