An examination of a structure may reveal its purpose or what the thing is for. We already know a great deal about the structure and purpose of the individual parts and organs of the human body, but what's the whole thing for. During a human anatomy laboratory at Harvard Medical School , televised on PBS, one student noted that if an ovary is removed or doesn't function correctly the oviduct associated with it, the tube that carries eggs from the ovaries to the uterus, will migrate across the body to link up with the other ovary on the other side of the body. One of the other medical students responds with the declaration, "We are made for reproduction." This fact is supported by other examinations or perspectives of human anatomy.     
    The reproductive organs are commonly regarded as accessory or nonessential body parts. Other organs are essential to life with many having residual capacity in case there is a loss of part of the function of the organs. More than 80% of the human liver may be destroyed by illness or toxins before that organ falls behind in it's functions. An entire kidney or lung may be removed or lost with no effect on the health of the owner. This residual capacity betokens the importance of the organ. "Nonessential" organs can also have residual capacity. Human females are born with over 100,000 eggs. This huge residual capacity also speaks to the importance of reproduction or perhaps to its preeminence. Reproductive organs seems less important because they can be removed with little effect upon the operation of the entire organism. Yet this is to look at things in reverse or upside down. The action of reproduction placed living things on the planet and so it is that reproduction is their purpose. The very fact that the reproductive organs have little part in the survival or maintenance of the organism is indicative of their importance.    
   The error in the perception that reproductive organs are only secondary organs can be seen through an examination of machines. Machines are created for a purpose and as mentioned that purpose is often readily discernible by an examination of the machine. For instance, spacecraft and other devices have "life support systems." These systems are certainly considered essential but are, of course, subservient to the overall purpose of the craft: allowing human beings to travel safely where they otherwise couldn't. The human beings in the craft might be thought "non-essential" as the craft can do quite nicely without them as  unmanned missions show.  
    Another simpler machine is the lawn mover whose purpose is well known and whose means of cutting grass is the spinning blade hidden within the housing of the mower. The mower's purpose is fulfilled through the action of the blade. Nevertheless, removing the blade will, as manifested throughout the rest of the machine, create a faster-moving, better running machine. Presently on the market are self-propelled movers that need only be turned on and set lose on the lawn. No human is required to guide it once it starts. Observing such a machine systematically go over a lawn with the grass behind it cut would lead one to think it is for cutting grass and perhaps watching human beings come and go through time leaving other human beings behind would also lead to conclusions about the purpose of humans. To return to the mower, however, with the blade removed the purpose of the implement would become unclear. Indeed if one tank of gas allowed the lawn to be traversed just once, the machine would seem merely to runs its course and die with only a mysterious purpose.  Now it can be seen that the machine is for the blade. It's purpose is to move the blade. The spark plug's purpose, the carburetor's purpose, the gas tank's purpose, in fact all the machine's parts have to do with the action and consequences of the blade. The newer, self-guiding mowers have some sort of navigation system or primitive brain to guide the machine over the lawn. That navigation system might be fit for other tasks but it's designed purpose was to guide the machine in order to cut the grass. The machine was not created so as to supply the navigation system with electric current and give it something to control and move.    
    To leave the inanimate, so it is with living things and the mind. The organism is about survival such that reproduction takes place. So it is also that all vital organs are to allow and facilitate that purpose.  Our reproductive organs, served by the vital organs, handle conception through birth with little need of conscious thought. From infancy to maturity, that is through to complete reproduction, guidance is required. The mind, consciousness, may be put to many uses and is. Yet, overshadowing all other purposes, its preeminent purpose, that for which it was created is and should be used, through its own particular abilities, is to further, forward and be integral to raising the young, to raising children.

We are made for children.