Well, actually, there you might be right or wrong. You see, when you've got a wholesome sweet girl that doesn't try to be sexy, there is a certain charm to that.... and that charm in itself could be perceived by some as sexy. I am sorry if this is twisted logic, but hear me out, for some that kind of logic may just carry the day.
Keep in mind this is my point of view. I don't claim to speak for all straight men, but it's
my personal opinion.
I get where you're going though. Personally, I think you can have the looks but lack (true) sex appeal. For the longest time I had Kiira Korpi in that category, for example.
To me, one of the key attributes of sex appeal (besides good looks, of course) is CONFIDENCE. You have to exude it, know what you've got, and not be afraid to show it off. As I mentioned before, Czisny completely lacks confidence on the ice. Strike one.
I typically don't mention or talk about costumes, but it's relevant here- she has a more conservative style. Nothing wrong with that (in many ways, it's a good thing actually), but in terms of SA, that's strike two.
Czisny's persona- she has chosen to take the route of putting herself forth as this wholesome, sweet, all smiles girl with no flaws (remember the Adam Rippon segment at Nationals? *cringe* ) This "wholesome" image just isn't helping mind-wise. Strike three. She's out!
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To be fair to Czisny though, vast majority of today's singles skaters lack it too (for different reasons- too young, too shy, haven't got it, etc).