Libido can also be classified as the urge to copulate. For humanity, the natural way in which this occurs is through sex. However, at a deep unconscious level, the two can be merged as one, given the reason in evolutionary terms for sexual attraction and sex drive. Using this term, the antonym of libido is destrudo.
Reduction in libido can occur from psychological causes such as loss of privacy and/or intimacy, stress, distraction or depression. It may also derive from the presence of environmental stressors such as prolonged exposure to elevated sound levels or bright light.
Increased androgen steroids (e.g. testosterone) generally have a positive correlation with libido in both sexes.
According to Swiss psychologist Carl Gustav Jung, the libido is identified as psychic energy. Duality (opposition) that creates the energy (or libido) of the psyche, which Jung asserts expresses itself only through symbols: “It is the energy that manifests itself in the life process and is perceived subjectively as striving and desire.”(Ellenberger, 697)
