The whole thing - the bigger ones like most BBWs have is very attractive. I like those the most where the view includes her anus, it is somehow extra-sexy if the anus is visible. Big and round is the best, but within limits - most African American women's behinds are too much - but a bit bigger and fuller is NICE.
On women i prefer a plump squishy ass that isnt too wide or droopy from cellulite. Just something bouncy that ripples nicely when smacked. On men, a tightly muscles bubble butt is the best.
Myself, I find most all types of Womens asses to be a thing of beauty. Perfect Ines, very skinny ones, a little extra.....I have been infatuated with the female rear since around 6th grade if I remember correctly. Its just evolved for me since then, and hense, my live of anal sex.
There seems to be an obsession with huge asses thes days (read Kardashian). I say each to their own but boy lets not forget the aesthetic delight of something tiny and firm.
Tiny and firm? How about a bicycle seat? I don't think that when people say they like "big asses" it literally means like huge big fat butts, I think it refers to curvature and overall shape. Or at least a bit of shape. Tiny and firm to me just comes across as some chick that doesn't eat and has a flat ass.