This is one explanation of the difference between nakedness and nudity.
But it's also all about the picture and the pose right? There's something so removed about the picture above. Even though you can see just about all of me. Perhaps that's just it, it's the distance and the scope. A close up feels more personal and more sensual than a longer shot.
To me, this shot definitely feels like a nude and less like a naked person. It looks engineered and structured, like my body is another piece of furniture in the room. On display. Perhaps it's also the spare quality of the window seat? The lack of cushy furnishings, blankets, pillows etc.
I took a picture last week with a similar pose but I'm in bed and you can see a lot more schmada (for lack of an official word) in the background. All the furnishing context helps make that previous picture look more candid and less posed, which in turn makes it feel more naked, I think.
This picture is a classic nude shot. And even though my bottom is bare, I doubt it will get removed from Instagram because it doesn't seem lascivious.
Funny how the rules work, isn't it?