Puppo V, Puppo G. Comprehensive Review of the Anatomy and Physiology of Male Ejaculation: Premature Ejaculation Is Not a Disease. Clinical Anatomy 2016; 29:111-119. Free pdf:   https://www.researchgate.net/publication/282813212_Comprehensive_Review_of_the_Anatomy_and_Physiology_of_Male_Ejaculation_Premature_Ejaculation_Is_Not_a_Disease