Agreed that it could all becone a bit theoretical but it seems to me that if we eant to say that something is acceptable because it is ' ART' then inevitably we end up at the issue of what do we call art. There are lots of photographs in art galleries, and as you noted, if this was a photograph would it feel the same? Mapplethorpe's photographs caused controversy but were at least in theory voluntary by those capable of giving consent. Would this pucture be ok if it was actually an imaginary sitter?
(Note I don't know what the answers are here so 'm not arguing for a particular view. )
But are we saying that this is acceptable because it is art, because it is skilfully executed or whatever? Maybe that is the argument of some; for me it is the fact that it opens up debate about the fact that it isn't acceptable that is key.
I think the fact that this is a painting removes us a step from the subject. And if you think about that, Therese, presumably, would have been required to assume that pose several times, for long periods of time, in a way that a photograph doesn't require. Do we become so blind to the skill of the artist that we ignore that?
Is it really enough to say that this painting is important now because of what it says about male power, as so many works of art do? Is there something to take from it and apply to the world of the people viewing it today?