"The percentage of theatre nerds and historians who seek out context are far outnumbered by the general populace hearing this tune in the mall."
Agreed, Laura. But even if you take the song completely out of context, I think the lyrics are fine as long as you don't take INDIVIDUAL LINES out of context. "The answer is no!" means something very different in the context of the other lyrics sung by "the Mouse" in this song (thanks for your analysis) than it would sound if the rest of the song consisted of lines like "Please get me my coat right now" and "I'm not going to stay here if you keep trying to persuade me to be physically intimate with you" But "the Mouse" doesn't say or sing anything like that. And as for that other line, there is a huge different between "I OUGHT to say no, no, no sir" and "I WANT to say no, no, no sir."
As for the happy change in attitude towards two unmarried people having sex with each other, and the decrease if not total elimination in the stigma against an unmarried woman doing so: I don't think it's true that "nobody ever mentions that aspect" of this song. But if they don't mention it, that too shows a lack of understanding of what's going on in the song and a failure to realize that it reflects excellent progress in terms of what we used to call "women's liberation."