well, my thought is, nude is natral, many fine art are nude art, i dont think u get sexual exceitment with the fine art nude picture, right?
But in other hand, picture and movie like that lead you to sinfull erotic thought and action, then u should beware.
a pervert can get exceitment even with full dressed woman, a pure mind person like painter see beauty on nude body.
You know which type you are and you handle it with great awareness, you decide what you want to be, that is.