>>2832408
>>2832529
Japanese referred to syphillis as a Chinese disease for a reason (Chinese men travelling to Japan like Zheng Zhilong who married Japanese or patronised Japanese brothels)


https://www.researchgate.net/publication/35207620_The_karayuki-san_of_Asia_1868-1938_the_role_of_prostitutes_overseas_in_Japanese_economic_and_social_development

https://researchportal.murdoch.edu.au/esploro/outputs/graduate/The-Karayuki-san-of-Asia-1868-1938-The/991005545393107891

https://dric.nrct.go.th/direct_download.php%3Fbibid%3D280688%26doc_id%3D492008%26name_dw%3DDRL021577-%25E0%25B8%259A%25E0%25B8%2597%25E0%25B8%2597%25E0%25B8%25B5%25E0%25B9%25883.pdf

https://malaycivilization.com.my/items/show/140821

https://www.tandfonline.com/doi/abs/10.1080/14672715.1993.10408345

https://researchportal.murdoch.edu.au/esploro/outputs/graduate/The-Karayuki-san-of-Asia-1868-1938-The/991005545393107891