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Sources

• "Aging changes in the male reproductive system." MedlinePlus.
  http://www.nlm.nih.gov/medlineplus/ency/article/004017.htm
• Gearon, Christopher J. "Dealing with Male Menopause." Discovery Health.
  http://health.discovery.com/centers/mens/articles/andropause.html
• Kerner, Ian, Ph.D. "Male menopause? Yes, it's real." MSNBC.com.
  http://www.msnbc.msn.com/id/24297959/
• Male Menopause. WebMD.
  http://men.webmd.com/guide/male-menopause
• Male menopause: Myth or reality? MayoClinic.com.
  http://www.mayoclinic.com/health/male-menopause/MC00058