The testes contain coiled structures called seminiferous tubules, this is where sperm production takes place. They produce over 12 billion sperm per month. The epididymis lies on top of the seminiferous tubules. Immature sperm travel from the seminiferous tubules to the epididymis where mature and are stored. The mature sperm travel from the epididymis through the vas deferens, which is a narrow, muscular tube-like strucure made up of smooth muscle. When these muscle fibers contract, they propel the sperm forward. They arrive first at the ampulla, the widest part of the vas deferens, and then enter into the ejaculatory ducts. In the ejaculatory ducts,the seminal vesicles produce liquid secretion that gets mixed with the sperm. Seminal fluid is rich fructose sugar (the sugar found naturally in fruits), which the sperm need as fuel (to stay alive and be able to swim) as well as alkalines (to maintain their medium alkaline, that is having a pH above 7, because sperm don't like acidic media where they cannot survive for long), which help to counteract the naturally acidic environment of the vagina and uterus thus allowing the sperm a better chance for survival.
The liquid mixture is pushed forward through the ejaculatory ducts all the way to the urethra, going first through the prostate gland, where milky prostatic fluid is added, forming the substance we call semen (the prostatic fluid helps the sperm swim faster, which is needed to reach the egg cell).
Finally, approximately a teaspoon of semen ejaculated) through the far end of the urethra.
A well-balanced diet, based on the nutrition pyramid, maintaining a healthy weight, avoiding noxious materials like cigarettes and illicit drugs, especially anabolic steroids (used to grow large muscles in a short period of time), avoiding exposure to toxins such as pesticides and heavy metals, and not indulging too much on alcoholic beverages are all measures that enhance healthy sperm production.