Bengalis, Have you been watching Japanese porn non-stop in the five years since your original observation? You must be exhausted -- in the best way!
Seriously, I love Japanese guys and their sweet, sweet porn as well. I hope I live to see the day the Japanese government relaxes their laws and does away with the genital masking.
Then, I wish their "porn culture" would move away from those sunglasses-as-disguises, and finally, stop using so much lube that it causes "strings" to develop each time they pull away during sex.
And to your other point, Korean and Chinese men/porn are great too, though the K-porn suffers from some modesty issues, as well. 😊