Serious question here. The Exo have no need for mammary glands that produce milk (boobies). I suppose they were "made in humanity's image" but what is [i]there[/i] instead? Does this make them have more parts than their male counterparts?
[url=http://i1.ytimg.com/vi/pDlaEcuBYIw/maxresdefault.jpg]The Exo are the robots if anyone is confused.[/url]
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[spoiler]I'm not sure if all of them were, but at least some of the first Exos were formerly humans. Their consciousnesses were transferred into the Exo bodies as a way of granting them a form of immortality. It's reasonable to assume that somebody would feel more comfortable in a body type that aligned with their human body. [/spoiler]