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The period at which an organism becomes sexually mature is called puberty. In temperate climates puberty occurs in boys at around the age of fourteen. At this time the secondary sexual characteristics begin to appear and the organs of reproduction exhibit a marked growth. The seminal secretions are found to contain ripe spermatozoa for the first time. The quantity of these secretions increases until it reaches its maximum at full maturity.

Nature has a device for disposing of the accumulation of the seminal fluid previous to the time when one begins to have regular sex relations. Every two weeks or so, when one is asleep, the secretions which have accumulated in the reservoirs of the vasa deferentia, the seminal vesicles and the prostate gland, stimulate the nerves that control the blood vessels of the penis, causing them to stop the flow of blood from the penis, so that it becomes erect and rigid. At the same time the muscular fibers which cause the semen to be expelled through the urethra are stimulated and a discharge occurs. The condition of erection of the penis is then relaxed. Such discharges are called nocturnal emissions (popularly "wet dreams"). Dreams of a sexual nature often accompany nocturnal emissions. The causal reaction between the emission and the dreams is not clear. Certainly the dream alone would not be sufficient to produce a discharge. Possibly the congestion of the sexual organs causes the dream and the dream may then lend further aid to the process which the congested organs have set in motion. The pressure of a full bladder probably helps also to cause erection, as nocturnal emissions usually occur near the end of a night's sleep when one's bladder is full.

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