I don't have the books here, been years since I read them, and a quick glance at Westeros' Wiki mentions nothing of the sort, so maybe it's me who's mistaken.

It's a bit hard to tell of course because the books only use Tyrion's PoV so we're just guessing at what Shae realizes or doesn't realize, but from what I recall (again, it's been a while), she does have him pretty much wrapped around her finger, until she goes way over the line with the Tywin thing of course.

Yeah, I guess the GoT scenarists saw Blackbook and thought "if WW2 movies are allowed to feature Carice semi- or entirely nude every ten minutes for no discernible reason other than her hotness, then surely HBO productions are too!". I'm still not sure how anyone manages to take that movie seriously (not just for that reason, but it doesn't help).

But more important than the nudity is, I totally agree with you, the loss of ambiguity and nuance in Stannis' character. Though Dom will no doubt argue that that was basically impossible to preserve on a show like this, especially with Stannis just one among dozens of important characters. And the writers do consider him important enough that his character is fairly nuanced - he's definitely on the "short list" that I mentioned in my other reply. Just not nearly as much so as in the books. Which I think is mostly problematic because in the books it still feels, even after five books, that the jury is still out on Stannis - we still don't really know what to think of him, or what kind of ending his story might have. Or I don't, anyway.