“Asian guys generally have short foreskin so they keep it retracted.
It’s considered unsightly to have foreskin covering the penis. In Japanese it’s called a 包茎 and if you look at shunga you’ll see that it’s exclusively on men meant to be depicted as ugly (not just in looks, but in character as well) ”
https://www.reddit.com/r/japan/comments/1zy17y/embarrassing_question_about_circumcision_in_japan/
Autocircumcision 