The major downfall here is, obviously, that you can’t ever touch Cortana (not that you could really touch any of these girls, but you know what I mean). This isn’t like a sexual harassment or work appropriate kind of thing, it’s because she’s a freaking hologram. No matter how hot she may get or how many digital squats she does to perk up that posterior, it ultimately just makes her that much more of a tease. For this reason alone, we can’t justify having her any higher on the list than number 10.