Being a man of pert near 80 years old I've seen asses change along cultural lines. A classic example of this is the Asian women, their asses were as flat as hoecakes when I was in the Korean War in 52-54 ,whilst the white American women asses were just as flat but
Much wider and their pelvic area were wider as well. Now the tables are turning ,because the African American women's asses aren't as shapely, curvaceous and well-rounded as they were before the war. Now the Blacks and Asian are 2nd and 3rd to the white woman's ases...