Male orgasmic disorder The physiological mechanism of normal orgasm The cycle of sexual response is under the control of a balanced interplay between the two major nervous systems, the sympathetic and the parasympathetic. In general, the sympathetic nervous system prompts action whereas the parasympathetic system's main action is recovery and calming. In order for a penis to become erect, its smooth muscles are relaxed and it becomes congested with blood vessels. This process is mediated by a complex cascade of humoral, neurological and circulatory events in which the parasympathetic nervous system plays a key role. Orgasm and ejaculation and subsequent relaxation of the penis are predominantly functions of the sympathetic nervous system. Thus, whereas emission is a balanced interplay between the parasympathetic and sympathetic nervous systems, orgasm and ejaculation are predominantly under the control of the sympathetic nervous system. The mechanisms of this system may be blocked by impaired function of the
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