Nude policy: AFIK, the policy seems to be - thankfully - that nudes are just fine, but anything pornish is not.
IMO, porn defeats the objective of nude photography, which I imagine to be the preservation against time of transient beauty. Whether or not concepts of beauty change over time, the point remains that I think we are, or probably should be, trying to record and conserve for ever, how wonderful something once looked. And the subject can't, of itself, do that for too many years.
I don't think there's validity for confusing nude photography with medical.
On a tangent: isn't it strange how some can become so stressed out about the matter: after all, every sister, mother, grandmother has the same basic equipment below the cotton, nylon, wool or whatever. The only difference is that some have it in a beautiful format and others not. Are the cries of the latter to defeat the joy of the former?
Rob C