definition libido
Definitions for libidolɪˈbi doʊ. libido(noun) (psychoanalysis) a Freudian term for sexual urge or desire. libido(n.) Sexual desire; the sexual instinct; the sex drive. libido(n.) (Psychoanalysis) Those desires and instinctual energies which are derived from the id.
In males, the frequency of ejaculations affects the levels of serum testosterone, a hormone which promotes libido. A study of 28 males aged 21–45 found that all but one of them had a peak (145.7% of baseline [117.8%–197.3%]) in serum testosterone on the 7th day of abstinence from ejaculation.