What is considered a big/nice sized butt?

Too hard to say since it depends on the whole body proportionality - the same size butt on two woman of different heights and widths would look so different. I think it is all in how you shake it and the self confidence you have that makes a difference in beauty.
But no one is perfect which allows us all to be beautiful in our own ways

 

I always liked small, round butts ... and, I never really paid attention to them until lately. Ive gotta say I love all sizes but shape is most important to me. Lately I've been loving huge asses.