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I. Main components
II. Main functions
     A. Gonads
     B. Accessory structures
          1. Reproductive functions
          2. Sexual activity
III. Male system - structures and functions
     A. Testes
          1. Vessels and interstitial cells
          2. Seminiferous tubules and sperm production
     B. Ducts
          1. Epididymis
          2. Ductus deferens and ejaculatory duct
          3. Urethra
     C. Glands
          1. Seminal vesicles
          2. Prostate gland
          3. Bulbourethral glands
     D. Penis
          1. Structure
          2. Erection
     E. Pubic hair
IV. Age changes in the male system
     A. Testes
          1. Size
          2. Seminiferous tubules and interstitial cells
          3. Sperm and hormone production
     B. Ducts
     C. Glands
          1. Seminal vesicles
          2. Prostate gland
          3. Bulbourethral glands
     D. Penis
V. Male sexual activity
     A. Diversity
     B. Excitement phase
     C. Plateau phase
     D. Orgasmic phase
     E. Resolution phase
     F. Refractory period
VI. Age changes in male sexual activity
     A. Contributing factors and heterogeneity
     B. Excitement phase
     C. Plateau phase
     D. Orgasmic phase
     E. Resolution phase
     F. Refractory period
     G. Summary
VII. Female system - structures and functions
     A. Main structures
     B. Ovaries, ovarian cycles, and hormones
     C. Oviducts
     D. Uterus and menstrual (uterine) cycles
     E. Vagina
     F. External structures (genitalia)
     G. Breasts
VIII. Age changes in the female system
     A. Menopause
     B. Ovaries
     C. Oviducts
     D. Uterus
          1. Before menopause
          2. During menopause
          3. After menopause
     E. Vagina
     F. External structures (genitalia)
     G. Breasts
IX. Female sexual activity
     A. Overview
     B. Excitement phase
     C. Plateau phase
     D. Orgasmic phase
     E. Resolution phase
X. Age changes in female sexual activity
     A. Contributing factors and heterogeneity
     B. Excitement phase
     C. Plateau phase
     D. Orgasmic phase
     E. Resolution phase
     F. Summary
XI. Frequency and enjoyment of sexual activity
     A. Trends
     B. Contributing factors
          1. Health
          2. Menopause
          3. Hormones
          4. Frequency
          5. Economic status
          6. Institutionalization
     C. Making adjustments
XII. Abnormal and disease conditions - incidence, risk factors, consequences, prevention, and treatment
     A. Benign prostatic hypertrophy (BPH)
     B. Impotence
     C. Prostate cancer
     D. Vaginal infections
     E. Breast cancer
     F. Endometrial cancer
     G. Ovarian cancer
     H. Cervical cancer
     I. Uterine fibroids
     J. Sexually transmitted diseases (STDs)

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