Will Miss #241 - attitude toward (same gender) nudity

One of my students had foreign guests visit her family and they went to an onsen. The foreign couple refused to take part with her family when visiting the hot springs even though it was all women in one pool and all men in a completely separate one. My student couldn't understand their squeamishness, and asked me why they wouldn't join them. I told her that we have a lot of shame in connection