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Penis shooting sperm

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Ejaculation may feel like a glorious mess, as uncontrollable as an avalanche or a runaway train. Ejaculation is the endpoint of a process that begins with a touch. Skin covering the shaft and glans of the penis is filled with nerve endings sensitive to pressure and vibration. More touching further increases sensitivity, in a positive feedback loop that can build to a show-stopping involuntary eruption. When enough stimulation trips arousal over into orgasm, it also triggers a storm of activity in the three ejaculatory centers deep in the brain. These areas, in the hypothalamus and the midbrain, fire off a pattern of impulses to coordinate the release of sperm from the testes, the creation of semen, and tie the final contractions tossing semen out of the body to the feelings of orgasm.

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