My friend's dad once told me that a woman is nothing more than a life support system for a vagina.. through the lense of Victorian era gender roles it's pretty true...but the same goes for men...
The same applies to all forms of life in nature - be they male, female, or even hermaphrodite. The whole has basically no other purpose than that of supporting the procreative system. Humans may have an over inflated ego, but when it boils down to it, the only thing that seperates us from all other life forms is that we are the only ones that will actively take steps to prevent procreation.