Where are Kunlun slaves from? What's so special about Kunlun slaves obsessed by women in Tang Dynasty?

In the old Tang book? Biography of Nan Man:? In southern Lin Yi, they all have curly hair and black bodies, and how much do they pass? Kunlun? . ? This sentence was said in the south of Lin Yi. That is, in southern Vietnam today, people with curly hair and dark skin are called? Kunlun? . Because it is in Shan Hai Jing, it is called Kunlun. There are people in China who are immortal. They were blackened all over because they ate the immortal tree near Kunlun, so in the Tang Dynasty, they called these dark-skinned people Kunlun slaves. Now most people guess that these so-called Kunlun slaves should be Africans who were sold to the Tang Dynasty in the context of the slave trade at that time. However, some people think that the so-called Kunlun slaves only refer to people in these places south of Vietnam. Their skin is a little brown for China people, but not as black as Africans. No matter where these Kunlun slaves came from, it was because of the economic prosperity and the openness and tolerance of foreign policy in the prosperous Tang Dynasty that a large number of foreigners came to China for trade exchanges in the Tang Dynasty. So it is not surprising to see all kinds of races in Luoyang, Chang 'an, a metropolis at that time. A large number of foreigners came to China to live and work, and Kunlun slave was the most famous among these foreigners. At that time, many wealthy families in Luoyang, Chang 'an were proud of having Kunlun slaves at home. A large number of Kunlun slaves are South China Sea blacks living on Southeast Asian islands. They are short and dark brown, and usually serve as footmen. According to historical records, Kunlun slaves are particularly good at diving and can open their eyes and take things underwater. So in the Tang Dynasty, Kunlun slaves tried to be sailors, repair ships and salvage. In Song Dynasty, Zhou Qufei's "A Generation Beyond the Ridge" also mentioned that in the southwest of the Central Plains, there is an overseas country called Kunlun Sleeping Country. On these islands, there are many barbaric savages whose bodies are like black paint, and they can be captured by food. After these people do it, they can sell it as slaves at a high price.