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The reproductive system ensures the survival of the species. Other systems in the body, such as the endocrine and urinary systems, work continuously to maintain homeostasis for the survival of the individual. An individual may live a long, healthy, and happy life without producing offspring, but if the species is to continue, at least some individuals must produce offspring.
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The corpus spongiosum is a spongy tissue column that runs through the penis' shaft (body) and glans (head). The urethra is surrounded by the corpus spongiosum. It has blood vessels that fill with blood to aid erection and keep the urethra open.