I think we're mixing up here personal taste and nude photography standards.
As you said, slip marks aren't really supposed to show up in staged nude photos, hence I pointed it out, so that maybe next time the photographer will avoid this common mistake (or maybe he'll tell us that it was intentional and explain why he did, who knows).
My choice of occasionally photographing people who are shaved and/or tattooed and/or pierced doesn't really defy any nude (or clothed) photography convention, so I believe your remark is just a matter of personal taste and I believe is a bit OT since nobody has posted pictures of shaved, tattoed and pierced people on this particular thread.
I agree that it might be a generational issue anyway