is dna...
your life is a mission for protect your dna with your body and your mind. when you have a child (in natural way), your mission is complete (so you can kill yourself)
(see:sad but true )
The most important thing in life is to endure the pain which stems from knowing death is certain. Why the hell do we have to bear to live or witness all the pain, suffering, misery, sickness, madness, politics, rape, war, crime, torture, and so on? Love? Pleasure? Hell with it! We all are genetic code guided fatuous animals who think themselves clever and important! I wish suicide would save me from myself!
self preservation. you cannot switch it off. when it all boils down to one thing, self preservation is the last man standing in your mind. sex, love, money etc. all are there for you to preserve yourself in your voracious being.