Even though a penis is controlled by the nervous system, it also has a mind of its own. Erections can occur at random due to some impulses firing from the brain during sleep and that is why most mornings, men experience ‘morning glows.’ The penis is turgid without a prior sexual arousal trigger. In fact, the penis does not need the man’s brain before it climaxes. It is basically the function of the penis than the brain of the man. Orgasm actually starts with the spine; the signal to ejaculate is the result of muscle contractions in the spinal cord and pelvis, not the brain. But amazingly, simple things like having a rough day at work can lead to a man not gaining an erection for a week.
