Erectile dysfunction (ED) refers to difficulty in starting and maintaining an adequate erection for satisfactory sexual performance and the stability of this condition (Burnett et al., 2018). The estimated prevalence of ED in men > 40 years of age is almost 50% (Bella, Lee, Carrier, Benard, & Brock, 2015). Different therapeutic agents have been developed for ED treatment, and their effect mechanism depends on the understanding of erection physiology. In ED treatment-resistant patients, lifestyle changes as a first-line treatment option and phosphodiesterase type 5 inhibitors (PDE5 inhibitors) as a second-line treatment option are used. PDE-5 inhibitors are noninvasive, generally well tolerated and efficient in most males. Intracavernosal injections (ICUs), such as alprostadil and papaverine, can be used in 25%-50% of patients who are irresponsive to the treatment and who contraindicate PDE5 inhibitors (Bella et al., 2015; Hatzimouratidis et al., 2019).