It has been said that one of the primary goals of art is to make people think and feel. And, while some art simply exists and does not really evoke any great things, some does just that. This is often the case with any form of art that may in some circles or ways be considered controversial. So, it is no doubt that it is a common reaction to the nude human form.
Perhaps it is a painting, or a drawing or even photography or a video, but for many people the nude human body brings about some from of reaction, whether it be positive or negative.
For me, it is a matter of how the work is designed that matters. In essence, the body naturally lends itself to art as that it is beautiful in all shapes, sizes and colors. The curves and the ways light rolls off of the skin is outstanding in and of itself. And, if done right, there is nothing inappropriate about it.