I guess its relative. I'm american and I'm not boob obsessed. And I don't generally hang out with weirdos who are, nor do I spend a lot of time in porn stores or loitering around the mature section of book stores. So America's obsession is lost on me. But I don't spend any time in Japan to differentiate between much of the more subdued artistry and their general obsession with lithe over-endowed females in sailor school-girl outfits. So unfortunately they get generalized