One more step

Note that this was before the modern custom of porn stars shaving off their pubic hair. When Kyle Rayner and Donna Troy broke up, it was for a variety of different reasons. She's nakeder than they are; why is this for aesthetic appreciation and this for arousal? Now that's what I call art, and it's not porny at all! National Geographic Nudity follows on the same "these naked people are depicted solely for educational purposes" line, not just in the trope-naming magazine, but in other venues too including an entire genre of magazine dedicated to nudism which was presumably educational to those interested in that subject matter