I don't think nakedness is necessarily related to titillation, which I am interpreting from your description of 'erotic beauty getting in the way.' Surely you have seen people who have their various bits covered up, but, as titillation is the point, titillation occurs. There are also nudes which are generally regarded as beautiful and not erotic to most, which was likely the intent of the artist - to celebrate the beauty of the body in a nonsexual way. To some however, as you have stated, there is no such thing as a nude which is not erotic. This attitude is at least partly societal, as Allen Friday's post regarding the sensitivity differences between Americans and Europeans illustrates, and partly internal, that is, how we each are internally affected by a work regardless of the 'norms' of society.