Hot, well proportioned, beautiful women don't need armor for protection. Their gaze, their move, and sexy poses give them more than enough protection against anyone who wants to harm them. XD Instead, the enemy wants to take them harmlessly to somewhere...private...if you know what i mean.
well assuming google's image results are accurate, her heart is more directly exposed... but now that i think about it, it might be good to have a blind spot like that. it'll be much more likely to have enemies attack from the side which is better for her weapon.