Seriously, though. I'm a big fan of artsy nerd girls. Twilight Sparkle is about as nerdy as they come, yet I've only seen TWO human renditions of her wearing glasses. makes NO sense to me at all.
I was actually going to draw her with glasses originally, but I thought it didn't make much sense to have her with glasses while in swimwear. And I think the reason a lot of people don't normally draw her with glasses is because of the fact that she's never seen in canon wearing glasses, though Rarity is.
I see what you're getting at; she's still sexier with glasses, but that's just my two cents.