Richard von Krafft-Ebing,
Psychopathia Sexualis
(1892)
“ Abnormally difficult ejaculation. It is occasioned by inexcitability of the centre (absence of libido, paralysis of the centre: organic, from disease of brain or spinal cord; functional, from sexual abuses, marasmus, diabetes, morphinism) , and, in this case, for the most part, in connection with anæsthesia of the genitals and paralysis of the erection centre. Or it is the result of a lesion of the reflex arc, or of peripheral anæsthesia (urethra) , or of aspermia. The ejaculation occurs not at all, or tardily, in the course of the sexual act, or only afterward, in the form of a pollution. ”
