Explanation

Ejaculation is the sympathetic response while erection is a parasympathetic response. Sympathetic and parasympathetic both are the part of autonomic nervous system. [table] Somatic Nervous System | Automatic Nervous System ; Conscious or voluntary regulation Fibres do not synapse after they leave the CNS (single neuron from CNS to effector organ) Innervates skeletal muscle fibres, always stimulatory | Functions without conscious awareness (involuntary) Fibres synapse once at a ganglion after they leave the CNS (two neuron chain motor control Innervates smooth muscle, cardiac muscle and glands either stimulates or inhibits [/table]