(including HIV) can be present in pre-ejaculate.

Emission phase

Once the penis has achieved sufficient stimulation for the man to reach orgasm, ejaculation begins. The initial stage of ejaculation, called emission, is controlled by a reflex in the sympathetic spinal cord. Sperm undergo their final developmental changes within the epididymis, where they are held until being ejaculated.

Expulsion phase

Ejaculation reaches its peak in the expulsion

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