PhD in Sexology and Psychosexual Counseling. For More Info WhatsApp- 9604715783/9359863878. Neurovascular Function: Erection cannot be attained if nerve signals do not prompt blood vessels to do their job or if blood flow to the penis is reduced. Nerve dysfunction can also diminish feeling in the penis, resulting in impotence. Many medications can cause erectile dysfunction by impairing either vascular or nerve function.