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The prostate is a walnut-sized gland positioned in
the lower abdomen just below the urinary bladder and
surrounding the urethra. Its primary purpose is to
provide seminal fluid for the male ejaculate during
sexual intercourse. Secondly, it is the seat of a man’s
sexual ability. A properly functioning prostate gland
and its surrounding nerve bundles are essential for
sexual function. When the prostate malfunctions, all
sorts of symptoms arise, including erectile dysfunction,
inability to reach an orgasm, pain on arousal or orgasm,
and various urinary problems.

Male anatomy. Source: Wikipedia
The urethra is a tube that passes through the prostate
and provides a channel for urine to move from the
urinary bladder through the penis and out of the body.
Its secondary purpose is to carry prostatic secretions
and seminal fluid containing sperm cells out of the body
through the penis during sexual intercourse.
Unfortunately, the strategic position of the prostate
surrounding the urethra is why it causes men significant
problems.
Usually, the prostate works seamlessly for much of a
man’s lifetime. But somewhere around the age of fifty,
it becomes troublesome. Some of its problems, like
enlarged prostate
or benign prostate hyperplasia (BPH) and
erectile dysfunction,
result mostly in discomfort and/or inconvenience. But
others, like cancer, are quite serious and possibly life
threatening.
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