he testes to the vas deferens, a tube which opens into the urethra. Sperm pass through the urethra and exit the body through the external opening of the urethra at the glans.
The prostate gland lies in the pelvic cavity and surrounds the urethra. It produces semen, the fluid in which sperm are ejaculated from the penis. Enlargement of the prostate with aging can put pressure on the urethra, causing urinary problems, and can interfere with erection of the penis (Baldwin, 1991, p. 136).
The physical effects of aging play a major role in erectile dysfunction. Neurological factors, such as diabetic neuropathy, can affect the nerves in the sensitive areas of the penis, making them less responsive and thus interfering with arousal (Baldwin, 1991, p. 184; Tierne
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