It's a little deeper than you may think....
If you only look on the surface of anything, you will only find what is on the surface...and yes, on the surface of things the amount of bleached blond, botoxed, collagen lipped, breast/arse implanted, lipo-sucked, whitened teeth and generally unnatural looking female American porn actresses featured in a huge proportion of porn video would imply our American friends do have a liking for such gastly looking creatures...
You have to look deeper than this and look at yourself as a man. Men generally like large breasts, they appeal to some basic instinct from birth. Men are programmed to be attracted to juicy red lips, men are programmed to be attracted to "healthy" fit bodies. Quite simply, men are attracted to those women who make the loudest "mating call". A tattoo is not just a tattoo, it's a device to draw a man's attention to a certain area of the body, again fulfilling his basic instinctive needs. If a movie maker can incorporate all these "features", they have a saleable product. The movie makers seek out the best examples of all these elements and use them to take your money from you. It's a kind of sublminal response men feel to porn which does not allow them to really care about "beauty" in the typical Japanese way. There are a huge number of Japanese "beauty" yet to many they lack any real sex appeal because the instinctive triggers are not so obviously visible.
I therefore conclude that the criticism we can justifiably throw at our American friends is that their tastes are generally raw and unsophisticated. I think this is exemplified in most other areas of American culture. It's visible in their food, humour, cars, movies, architecture, art and most other areas of national culture. The question I therefore would like to ask is why do Americans generally have no class?