I certainly would disagree that the nude as an art form originated in Ancient Greece and did not resurface again until the Renaissance.
Certainly, following after the Greeks but within "western" culture; the nude was prominent in Roman sculpture. Even more ancient, nude renditions have been found in ancient Egyptian art - including fertility renderings that include outsized penises and female breasts etc.
Further, one can find nude art in ancient India and China etc. And the nude carvings from Africa that inspired Picasso are also ignored by your statement.
Moving to the Western Hemisphere, various Mezo-American cultures regularly depicted nudes in their art including, famously, "action shots" of young men competing at various sporting games.