Abnormalities in the metabolism of sex hormones are frequently observed in cirrhotic patients, especially in chronic alcoholics. Signs of hypogonadism with disturbed reproductive and endocrine gonadal functions are found in men as well as in women. Primary hypogonadism as well as hypothalamic-pituitary inhibition seem to play a role. Primary gonadal insufficiency is the result of a direct toxic effect of ethanol and of acetaldehyde on the gonads with inhibition of LH binding to the Leydig cells, with inhibition of the enzymes responsible for the formation of sex hormones, and with inhibition of the intratesticular activation of vitamin A. Hypothalamic-pituitary hypogonadism also results from a direct toxic effect of ethanol as well as from the increasing concentrations of oestrogens in the plasma. Men with alcoholic cirrhosis may also be characterized by signs of feminization, which mainly result from an increased peripheral conversion of androgens. In men who abstain from alcohol, a spontaneous recovery of sexual functions can occur, especially when no testicular atrophy is found and when the response of gonadotrophins after stimulation with LH-RH is normal. Therapeutically, only the administration of non-aromatizable androgens in high doses seems to lead to recovery of potency.