Allow me to disagree. First: there's no evidence of any change in your body, as a male, after becoming a father.
Second: supposing such a "wireless" change would happen, getting someone pregnant and immediately disappearing from their life would yield a perceptible change even with distance and no involvement with the life of the child.
Third: I personally think there's no innate drive to parent, and only an innate drive to mate; everything else is injected by society.