Response: Useless Organs

In response to Brandon's post "Not Using = Misusing?" (February 26, 2012):

I agree that Levin might well think that not using something is essentially the same as misusing that thing.  Considering that he used the term 'asexual' to refer to people who wished to have sexual relations with others but for whatever reason were not able to do so, it seems likely that he is not aware of that particular orientation, and would likely disbelieve in its existence if someone informed him of it.

Furthermore, I think this idea of not using being the same as misusing probably extends to nonreproductive body parts as well.  However, once one does extend it, it becomes harder to support.  Canine teeth are intended to tear meat - does this mean that all people who do not consume meat are misusing their canine teeth?  There are muscles in the body which, in modern society, almost no one ever uses.  Also, what of apparently useless organs, such as the appendix?  Is it possible that the appendix did, historically, have a use, which is no longer utilized due to changing conditions?  If so, this might mean that all of humanity is guilty of misusing (due to not using) their appendixes.  Alternately, the appendix might truly be a useless organ, the only purpose of which is to sit there in a person's body and occasionally require surgical removal.  In that case, could one not use this to argue that not every part of the body has a single, fixed use?