Honestly I don’t think I fully appreciate the difference between artistic nudes and pornography. I’ve seen some very “artistic” porn and some “artistic” nudes that seem pretty erotic, and other stuff that blurs the lines. Art itself is a pretty nebulous concept so the whole thing is fuzzy to me. You have obvious examples like “the statue of David”, or the “Birth of Venus” that are clearly art. I’ve seen modern nude photography of women made up in the classic pinup girl style, which was porn back then but is art now? I’ve heard of people engaging in sexual acts as a type of performance art.
I guess my answer is that nude art makes me uncomfortable because I’m not entirely sure how I’m supposed to feel about it. Am I supposed to feel sexual emotions or is that inappropriate? Is it just a clinical study of anatomy, light/shadow/shapes/humanity?