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How does erection occur?

Erection of penis begins with sexual stimulation, arousal, impulse, or excitation. Sexual stimulation can be mental (for example: by having sexual fantasies, imaginations, illusions, daydreams, portray in the mind) or tactile (for example: by touch, visual, smell, by touching the penis,). Sexual stimulation makes electrical impulses running through the nerves going to the penis and causes the nerves to release nitric oxide (chemical release in body) , which in turn increases the production of cyclic GMP (cGMP or cyclic guanosine monophosphate acts as a messenger and send continuous signal to brain) in the smooth muscle cells of the corpora cavernosa. The cGMP causes the smooth muscles of the corpora cavernosa to relax, and allow rapid blood flow into the penis. The rapid in-coming blood fills the corpora cavernosa, making the penis tissues expand and erect hard.