My background is Art History, and we were taught that a “nude” figure is very different from a “naked” one. These two terms are the essence of the distinction that is being covered (rather uncovered) by the subject.
Formally speaking, a nude is a generalized, idealized figure, which may represent a real historical person, or even a vague concept (like Justice or Liberty or Victory), but has no actual resemblence to a real person. It is not a portrait in that sense. It is not personal. In this case, the viewer is rather detached from having a physical, carnal response to the subject.
A naked figure is a real and specific person, and is recognizable. Photographic “nudes” can scarcely avoid being a naked image.
Further, nakedness is an exposed, compromised, helpless condition which is further exascerbated by skimpy, half-removed garments. These renderings only serve to excite the senses, in any medium. The appeal is to the male and his sense of control.
As to the Renaissance greco-roman style work, esp. what you’d find in Italy - these figures tend more toward the realm of the nude. They are mostly innocent. But the older I get, the more I am not a fan of it, or at least as far as church art goes. None of the nudes of Michelangelo, etc, stir me in a carnal way, so it is not about that. I just question the usefulness or appropriateness in an ecclesial setting. I think people should dress up, not down, for Mass, so why is the art nude? Not logical to me. My guess is that it is a culture born out of a persistent Italian (Roman) humanistic attitude which glorifies man and humanity physically, not spiritually.
But that is just my opinion.