I guess I'll jump in however it is to help out and not stir things up

So my background comes from being trained as a fine art painting major and I was blessed by having some great teachers at college to explain a few important lessons, rules and respect for the human body be it a woman or a man posing for you and your painting or a photo.
I was taught that tasteful was in the way the body was not "used" but embraced for a composition (I think we all get that here). Most would consider a tasteful nude as pure appreciation of the human body itself and as it's form such as the subtle curves, angles and shadows it casts upon itself or light from the surrounding area which it shares.
This could range from not having most of the focus concentrated between the legs or only on the breasts, suggesting the form as tasteful and the only areas that matter without the reaction of think sex right away. Some will say tasteful would be having cloth of some sort over the private areas because most of the population can not and doesn't see the human form as a form but what we have been exposed to hearing from others. Example of non tasteful, and this is from some of my teachers because of the background of the artist would be some of Freuds work. I like his brush work, but most will scream he degrades, disrespects and demeans a human being and therefor destroys the form so that no one that sees this can get past that to see the techniques applied. Did he do this with everything, no, men, sometimes, women, a lot. Just an example…
I think that a tasteful nude conveys the subject being or showing empowerment at some core level that anyone could see even if they never studied art before. I agree some people feel different about what is tasteful and seem to confuse free will with tasteful and everyone has the right to…argument but
over time the term tasteful in it's true sense has been lost as with many terms many times. Also, this is to me the biggest issue with tasteful, how is the photo used? Where, when and why. Take one photo and use it in a certain way, then that same photo that would be tasteful in every sense in the first place is now put in a less than desirable setting and because of only that placement it becomes polluted and is no longer what it started out as, tasteful. I also feel that people just (as you pointed out) do it for the effect of what will happen. We all know those disturbers of the peace a time or two in our life's journey.
Sure, you could have anyone sitting or laying there with clothes, a bed sheet or whatever but the only time I've heard a general consensus about a tasteful nude would be when a baby has a photo or painting taken/made. Is that only because we see them up to a certain point as pure (implying it's tasteful) and after some fictitious arbitrary age a human looses that quality? I think Maximillion had a photo in POTD of a baby that was by far the best I've ever seen. It was in every sense tasteful, beautiful and a human displaying only a form that a human can.
I always think back to the Roman and Greek times when people didn't where much and that in itself was considered tasteful as was laying around nude during those times. Since then as I said before, the word is what has been skewed and disconnected from the actions it was intended for.
You know a phone call would have been much easier for this, lol, but everyone has a different take and in the mean time I'll mutter to myself a "seriously" or "are you kidding me" when I see or hear the tastefully nude statement and it's another display of degrading for the shock value or to make a name for one's self.
Peace