effective advertising?

I was out getting lunch/dinner/whatever you call it when it's your first meal since breakfast and are eating at 5:45 pm. Anyway, the subway station is covered with ads for Sony's new e-book reader (called simply "The Reader") and one of them is a picture of the device with the text "Sexier than a librarian."

Since librarians are already sexy, this must mean that Sony had to pull out all the stops in order to create an electronic device that could be even sexier. There's a device I want to get my hands on.

I suppose there are a number of possible ways to interpret the ad. But I'm pretty sure my theory is right.