Answer / biomaster

S2-S4.

Answer / henry

An erection can be stimulated by the ankle and other parts
of the feet. Also all along the crack in the butt. The
nerve endings there are very sensual in nature. S2 S3 S4
as well as S4 are involved here. The penis is most
affected by S3 and S4. The S dermatomes interact with each
other thus many can be involved.

Answer / joseph anzalone

The above answer is partially correct. Men normally have two
types of erections. The brain is the source of psychogenic
erections. The process begins with sexual thoughts or seeing
or hearing something stimulating or arousing. Signals from
the brain are then sent through the nerves of the spinal
cord down to the T10-L2 levels. The signals are then relayed
to the penis and trigger an erection. A reflex erection
occurs with direct physical contact to the penis or other
erotic areas such as the ears, nipples or neck. A reflex
erection is involuntary and can occur without sexually
stimulating thoughts. The nerves that control a man’s
ability to have a reflex erection are located in the sacral
nerves (S2-S4) of the spinal cord.

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