Male erection is an example of? No thought or emotion is required for it to occur, but conscious control can influence it ?

Male erection is a physiological phenomenon, which is an example of a reflex action. It occurs when the parasympathetic nervous system sends signals causing the relaxation of muscles in the penis and allowing increased blood flow to fill the veins. This increased pressure causes expansion, leading to an erect penis (Urology Care Foundation, 2019). No thought or emotion is necessary for an erection to occur; however, conscious control can influence it.