Honestly, I've got a soft spot for these scenes. I was wondering if you know any scenes from Korean Drama that involve girls pooping? So far, I know of these two:
Que Sera, Sera Episode 1 - A girl has to poop in a strangers apartment after trying to hold it in all night.
http://www.dramafever.com/drama/13/1/Que_Sera,_Sera/
Dream High Episode 3 - A constipated girl is trying to poop with a guy nearby, he tells her to sing to cover up the sound... it's honestly not that great, but perhaps it's worth watching.
http://www.viki.com/videos/92728v-dream-high-episode-3
Que Sera, Sera Episode 1 - 8:55
Dream High Episode 3 - 23:27
For those who don't like to just search up the time just skipping randomly.