Also, why is there so much Japanese porn being produced? There is shit from Hentai, all they way down to scat. I'm still waiting to see a professionally made Korean porn. Most of the korean porn I see are home made.
So going back to the original topic, why there are more Korean SP vs Japanese SP? Many asian SPs will advertise their nationality based on popularity. I know that many chinese will advertise as being Korean, but when you ask them to speak a word in Korean, they will say something in Chinese hoping that the client will not be able to tell the difference.
For the same reason that there are more Korean convenience store owners in the GTA than Japenese ones, there are more Korean SPs than Japanese SPs. Japan is a much more wealthy country than Korea, although Korean is catching up. The wealth of the country is inversely proportional to the propensity of a country's women to immigrate to work as SPs. Also Koreans share more of a desire or ability to immigrate and become establish small business than do Japanese who tend to like to at this time in history, except for vacations, remain in Japan and work for large companies. Korea does not have a miltary history of invading and annexing their neighbours as does Japan and Germany. The pscyhe of the Japanese is still very much damaged by its' relatively recent humilating defeat in the last century, however for Japan to have carried out much of the same actions or atrocities that Germany did, they would have had to have believed in their supreme superiorty over all other races and nations and many Japanese continue to still hold these beliefs. Now to be an SP, requires accepting at times much humilation and degradation and if the SP feels that other nations and races are beneath them, then they may only be able to have sex with their own nationality, unless they are almost starving, which the Japanese are not. IMHO, many Japanese women that I have met, have an aura of superiority and disdain for non-Japanese. Yes they will have sex with non-Japanese but would be unlikely to become prostitutes for non-Japanese for the the aforementioned reasons. Korean women do not share this problem to the same degree. I have mentioned before that the Yakuza controls the SP trade in Japan and there are no Yakuza in the GTA.
* As an aside, it would be easier to bang a Japanese ESL or working holiday visa lady than a Korean one, but for different reasons