The resolution of a single frame of high definition video is just a little more than 1 megapixel. That's ONE and only on the full 1080i. 720p is even smaller. No one seems to bitch about clarity issues with 10 and 20 megapixel still cameras.
Even then, HD is nowhere near as clear (yet) as film but no one is dissing Blake Edwards for his visual images.
Now to answer the question. Yes, porn in HD is necessary and here's why......
Standard Definition sets are being phased out (i.e. less and less are being made each year). Eventually there will be no more SD TVs. Then how will you get your porn fix?
Doesn't matter which player format wins(WMV-HD or BluRay) because it's all going to be download or VOD anyway. The Disc is dead.
Anyone with a computer can watch HD content. You don't even need to upgrade equipment.
So if VHS is still good enough for you, I have to ask, "Why did you ever upgrade from cave paintings?"
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I'd rather be ignorant than stupid.
Ignorance implies a lack of knowledge which is easily correctable through education.
Stupidity implies an inability to learn.
Therefore; ignorance is temporary, stupidity is forever!