socialization and enculturation than this "general brain structure" you mention. How come that certain societies think big is beautiful whereas others think the total opposite? Just look at Tonga for an example of this. If it had to do with brain patterns, we all would find the same beautiful. Turns out, we don't. Much of that is ruled by where, when and how we grow up, just to scratch the iceberg. And then there is more to it that we cannot explain, that shapes our taste.
TL/DR: science says you are a retard.