Earlier quoted context omitted.
Because that’s the normal context where naked women appear in mass media.
So you are saying that Americans’ puritanical view of the body is mainly due to seeing the world mainly through the media?
What little non sexual nudity is left (sharing showers at health clubs, for example) is becoming rarer and rarer.
And co-Ed nonsexual nudity is virtually non-existent.
When I was in secondary school in the 90s, we were expected to shower together, but refused to without consequence.
We all signed up for gym class at the last hour so we could shower at home.