Three-dimensional visualization reconstructed from scanned human data. Anteriolateral view of the male reproductive system during ejaculation; the penis is seen in sagittal cross-section, as semen exits the urethra. The ultimate goal of the male reproductive system is to produce and deliver the male gamete, sperm. From its production site in the testes, sperm is corralled into the epididymides and up into the vasa deferentia; these join with the seminal vesicles to form the ejaculatory duct. From here, the prostate, seminal vesicles, and vasa deferentia contract and force the ejaculate into a bulb at the base of the urethra. The seminal vesicles, prostate, and bulbourethral glands also contribute secretions which, when combined with sperm, make up the ejaculate. All these activities comprise the first phase of male ejaculation. The second phase occurs when the urethral bulb and penis contract rhythmically to expel the ejaculate out the tip of the penis.

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