opinions on possbuttiblities?

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what is the most rare and op girl butt?obviously the most beautiful traits among women are rare and im almost positive ive checked out every butt possibility but im thinking there might be one or two out there i haven't seen yet.
pic is of decent skinny girl bubble butt. not the best imo but definitely a butt worth looking at.
http://www.dailymail.co.uk/femail/article-4184986/Abby-Pollak-s-butt-photos-impressive.html
in link is a girl who had no butt and then she gained weight and had a huge butt of the athletic type that is lots of muscle and heart-shaped and beautiful under a skinny waistline. it seems like these butts are more rare and definitely turn a lot of heads because they have almost unnatural curves which end up being very aesthetically pleasing upon a closer look.
is there a previously unknown butt designed mysteriously in an underground human anatomy factory that has the most boner popping goodness of all?
no porn keep it classy san diego