The large breast fascination is not limited to America - though perhaps we may have exported it to some degree. I've read that Japanese prostitutes started using industrial silicone as breast enhancement during the post-WWII occupation to appeal to American servicemen. Now, they have their own J-Cup fetish. I think it's more instinct by now than anything. IMO Even men who may prefer smaller breasts are still drawn visually to large ones. Hell, even gay men probably look :-) I know that I can register a female form in a banner add faster than should be accounted for by normal visual facilities.

The problem with Cynthia's sanctum sanctorum is (per the pic at least) that it's too detailed for 'art' and too rudimentary for graphic erotic or medical images. I'd say that it's neither fish nor fowl but that might be too much. 

"Democracy is a pathetic belief in the collective wisdom of individual ignorance." - H. L. Mencken