In psychology, sex drive, aka "libido", refers to the theory that there exists a tending to be insatiable urge, need, or drive of animate chnopsological matter to engage in intercourse, sex, and or exchange of genetic material.
History
In 1892, German physicist Karl Pearson stated the following: [1]
“The economic condition of any nation during a given period is closely associated with its rate of reproductivity and with its indirect struggle against its neighbors for land and food. Not less important for the stability of any nation is the nature of the prevailing forms of ownership, sex-relationship, and family life … It is only when we turn to the less complex stage of social growth that we fully grasp the direct bearing which the struggle for food and for the gratification of the sexual instinct has had in moulding human development. It is this struggle which is the fundamental formula for the description of all existing systems of ownership and of marriage in its widest sense.”
“Sex is the apparent division of the father-mother substance of mind into apparent opposites. This division is due to the opposite desires of electricity and magnetism, expressed in the action and reaction of the thinking process. Sex is the active desire of mind for division into opposites, and its reactive desire for unity. Sex is that motive force which demands separability into two, and equally desires union of the apparent two into one. Sex desire is that force in thinking that continues thinking. Existence is continued only through thinking. Sex force is that quality in the electro-magnetic impulse of thinking which continues one impulse of thinking into the next impulse of thinking.”— Walter Russell (1927), The Universal One [3]