"norks" ???
Obviously we can't criticize the Solomon Island women; they're just too primitive to realize that human breasts are obscene.

Going by my experience, violent reactions to nudity are generally based in religious "customs" of declaring selected parts of the human body to be obscene (if seen by anyone other than a spouse, however the "logic" of that works). One of these days I'm going to start approaching assorted believers, in situations where nudity hasn't been mentioned, and asking, "Do you believe God would create anything obscene?" I will be very surprised if anyone says yes.

For a substantial share of "civilized" people, the critical issue is that children might see adult nudity and be traumatized or corrupted. I would submit that the only reason a child would be affected significantly by simply nudity would be that the child has been conditioned to react to it.