Libido, sexual drive (impulse) (“lust” in Latin) – a mental manifestation of arousal originating deep in the organism and aiming to satisfy one’s sexual needs. It constitutes motivational factors conditioned by the biological structure of the organism which inspire behavioural forms aiming to satisfy the needs. According to Hans Giese, a sexual drive is a selective state of readiness to accept  one’s partner in the area of his or her sexuality.  Carl Gustav Jung’s concept of the libido category is broader; in it, libido is perceived as a general mental energy. According to Jung, libido is either directed outside (extroverted libido) or inside (introverted libido). Both mechanisms, introversion and extraversion, are natural and can be found in everyone. A conscious extroverted attitude is complemented by unconscious introverted attitude and vice versa. The unconscious part of libido (introversion in the case of extraversion; extraversion in the case of introversion) composes our personal shadow.