"Nutrition"...
Is only a derived phenomenon; the primitive form of it was the will to stuff everything inside one's own skin.
"Procreation"...
Only derived; originally, in those cases In which one will was unable to organise the collective mass it had appropriated, an opposing will came into power, which undertook to effect the separation and establish a new centre of organisation, after a struggle with the original will.
"Pleasure"...
Is a feeling of power (presupposing the existence of pain).
658.
(1) The organic functions shown to be but forms of the fundamental will, the will to power,—and buds thereof.
(2) The will to power specialises itself as will to nutrition, to property, to tools, to servants (obedience), and to rulers: the body as an example.—The stronger will directs the weaker. There is no other form of causality than that of will to will. It is not to be explained mechanically.