I'd consider Japan a bit of a special case. Remember that in that case, it's tied directly to a particular character (one that, canonically, is an adult, funnily enough). Not only that, those are most likely not realistic depictions. Western sex toys of that kind tend to try approximating the "real thing" as closely as possible, while what I've seen of Japanese dolls in general (not much, admittedly), they tend to be highly stylized, like most Japanese art. You can't really equate the two. I understood that the discussion was specifically about "dolls for pedophiles", with realistic depiction of a generic child. Sexual fetish for a particular fictional character is distinct from pedophilia (though this can seem murky at times), even if she happens to be underage.
Japanese approach to both sexuality and technology is radically different from us anyway. For them, sexbots will be a no-brainer. In fact, they will almost certainly first appear in Japan, likely with highly idealized "anime" proportions.
