PhD in Sexology and Psychosexual Counseling. For More Info WhatsApp- 9604715783/9359863878. The penis receives a double nerve supply; from the spinal nerves as well as from the spinal nerves as well as from the Autonomic Nervous system. The spinal nerve supply conveys the sensation of touch from the penis to the sensory center in the brain via the spinal cord. The stimulation of parasympathetic nerves (Nervi erigentes) causes erection, while the stimulation of sympathetic nerves causes ejaculation and loss of erection.