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Sympathetic nervous system orgasm
Regardless of the source of these signals, the excitatory nerves in the penis respond by releasing proerectile neurotransmitters such as nitric oxide and acetylcholine. Because arousal precedes orgasm, the autonomic nervous system first needs to do its own work before the complex pelvic neural network can work its own magic. Many regions in the brain contribute to male sexual response, ranging from centers in the hindbrain that also regulate basic body functions such as breathing, to areas in the cerebral cortex, the organ that controls higher thought and intellect.