Human sexual response: D) Neural control of the sexual response in males: i) What tissues are involved? ii) What is the role of the parasympathetic

v) What alternatives are there to Viagra in men who have lost all parasympathetic input to their penis? Why do these alternatives work?

E) What are the differences between reflexogenic and psychogenic sexual responses?

F) What are the causes of hypoactive sexual desire disorder (HSDD) and what are the treatment options?