All I got from this is people need to get over being naked / seen naked.
In Japan it's common to get naked with strangers people of the same sex at a hot spring. IIUC in Finland it's common to get naked with strangers of all sexes at a sauna.
In the past, in the USA it was common to take communal same-sex showers in PE class in junior high school and high school.
But sometime in the past 40 years, that seems to have changed in the USA. I've met lots of 20 somethings and 30 somethings that can't handle a sauna or hot spring because they claim they've never been naked with anyone else. WTF!