I wonder if it's a thing in South East Asia... I had a Japanese friend in uni, and after we graduated, we took a trip to Japan (he was going home, I was spending 3 weeks there). He took me to an onsen, which is like a naturally heated bath/hot spring. They're extremely popular in Japan, and it's a big part of their culture. It was a little weird as you have to enter completely naked - no towels or shorts. Before entering, my friend advised me to roll back my foreskin, which felt really weird, but his advice had proved bulletproof on every other aspect of my trip, so obliged. Being the only westerner in the onsen, i got a lot of attention - mainly because I had more body hair than the Japanese men, and also because of my penis.
I noticed that all the men appeared to be circumcised, which was odd, as I didn't know it was a thing in Japan. Anyway, I asked my friend, and he said the men were not circumcised - it was just traditional for men to keep their foreskin permanently retracted, mainly for aesthetic reasons. Japanese men view other men who have their foreskin covering their glans as less clean less pleasing. Japanese boys are urged to retract their foreskins as soon as they physically can, and they remain that way into adulthood. He showed me that he still had the remnants of his foreskin, but due to permanent retraction it had shrunk and almost disappeared. Apparently the Japanese men were asking why I had rolled back my 'anteater' - they are used to European men having their glans fully covered, with the tip of the foreskin like an ant-eaters nose!