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  2. Quick Facts: Men's Health Issues/
  3. Biology of the Male Reproductive System/
    Biology of the Male Reproductive System
    • Overview of the Male Reproductive System
      • What is the male reproductive system?
      • How does the male reproductive system work?
        • What are sperm and semen?
        • What is an erection?
        • What is ejaculation?
        • What happens after ejaculation?
      • What can go wrong with a man's reproductive system?
    • Puberty in Boys
      • What is puberty?
      • What causes puberty in boys?
      • What changes happen during puberty in boys?
      • What can go wrong with puberty?
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