Tell me if this makes sense

Korean go to bathhouses (jimjilbangs), where they are completely naked and see each others' bodies. Also, when going to places like the pool-like myself, they see each other naked. So pretty much, nakedness, or seeing the bare parts of the body is like second nature. I mean... you see from very very young kids to very very old men and women in saunas, bathouses, etc. YET..... when i show a video in class on this one girl's daily routine, all the boys and girls scream "oahhawww..// ohhhh " when the video shows the girl's pj's dropping to the ground so that she can put on her jeans. (so the video shows the girl's legs). I mean.... am i crazy, or is there absolutely no sense whatsoever in this?