Libido

In psychology, libido (/lɪˈbiːdoʊ/; from the Latin libīdō, 'desire') is psychic drive or energy, usually conceived as sexual in nature, but sometimes conceived as including other forms of desire.^[1] The term libido was originally used by the neurologist and pioneering psychoanalyst Sigmund Freud who began by employing it simply to denote sexual desire. Over time it came to signify the psychic energy of the sexual drive, and became a vital concept in psychoanalytic theory. Freud's later conception was broadened to include the fundamental energy of all expressions of love, pleasure, and self-preservation.^[2][3]

In common or colloquial usage, a person's overall sexual drive is often referred to as that person's "libido". In this sense, libido is influenced by biological, psychological, and social factors. Biologically, the sex hormones and associated neurotransmitters that act upon the nucleus accumbens (primarily testosterone, estrogen, and dopamine, respectively) regulate sex drive in humans.^[4] Sexual drive can be affected by social factors such as work and family; psychological factors such as personality and stress; also by medical conditions, medications, lifestyle, relationship issues, and age.