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Chapter Four. Male Sexual Anatomy, Physiology, and Response. Male Sex Organs: What Are They for?. Sex organs serve a reproductive function Also serve other functions: Bringing pleasure to self Giving pleasure to others May serve to attract potential sexual partners

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chapter four

Chapter Four

Male Sexual Anatomy, Physiology, and Response

male sex organs what are they for
Male Sex Organs: What Are They for?
  • Sex organs serve a reproductive function
  • Also serve other functions:
    • Bringing pleasure to self
    • Giving pleasure to others
    • May serve to attract potential sexual partners
    • Sharing of genital sexuality can play a bonding role in relationships
external structures
External Structures
  • The penis
  • The scrotum
the penis
The Penis
  • Penis: from Latin word for tail
    • organ through which sperm and urine pass
  • Three main sections:
    • Root: attaches penis within the pelvic cavity
    • Shaft: contains 3 parallel columns of erectile tissue
      • Corpora cavernosa: 2 columns along the front surface
      • Corpus spongiosum: runs beneath corpora cavernosa, also forms the glans
the penis1
The Penis
  • Glans penis: head of penis; most sensitive
    • Corona: rim at base of the glans
    • Frenulum: on underside of penis; triangle of sensitive skin
    • Foreskin: sleeve-like covering of the glans
    • Circumcision
  • Urethra: tube that transports urine and semen
    • When penis erect, urinary duct is blocked
the penis myths
The Penis: Myths
  • Penis size not linked to body size or weight, muscular structure, race or ethnicity or sexual orientation
  • No relationship between penis size and ability to have sexual intercourse or satisfy a partner
the scrotum
The Scrotum
  • A pouch of skin that holds the two testicles
  • Scrotum skin more heavily pigmented
  • Sparsely covered with hair
  • Divided in the middle by a ridge of skin
  • Testicle temperature control: 93°F
internal structures
Internal Structures
  • Testes:
    • Two major functions: sperm and hormone production
    • Shaped like olives
    • Size and weight decrease as men age
    • Not usually symmetrical
    • Suspended by spermatic cord
    • Within each testicle, there are Seminiferous tubules
internal structures1
Internal Structures
  • Epididymis
    • C shaped structure on the back of the teste
  • Vas Deferens
    • The ducts that carry sperm from testicles to urethra for ejaculation
    • Joins the ejaculatory duct within prostate gland
internal structures2
Internal Structures
  • Seminal vesicles
    • Secrete fluid that makes up 60% of semen
  • Prostate gland
    • Secretes fluid that makes up 30-35% of semen
    • Can be stimulated in anal play
  • Cowper’s (bulbourethral) glands
    • Secrete thick clear mucus prior to ejaculation
  • Urethra
other structures
Other structures
  • Breasts
  • Anus
  • Buttocks
  • Rectum
male sexual physiology
Male Sexual Physiology
  • Production of hormones
  • Spermatogenesis
male reproductive hormones
Male Reproductive Hormones
  • Testosterone
    • Acts on seminiferous tubules to produce sperm
    • Regulates sex drive
    • Is responsible for development of secondary sex characteristics in puberty
    • Influences growth of bones and muscle mass
spermatogenesis
Spermatogenesis
  • Ongoing process starting at puberty
    • sperm produced within seminiferous tubules of testicles (64-72 days)
    • 20 days for sperm to travel through epididymis
    • Upon ejaculation, sperm expelled through urethra by muscular contractions
male sexual response
Male Sexual Response
  • Erection
    • Blood vessels expand and increase blood in penis
    • Veins that normally carry blood out are compressed, leading to engorgement of penis
    • Secretions from Cowper’s glands appear at tip
ejaculation and orgasm
Ejaculation and Orgasm
  • Emission stage
    • Sperm sent into vas deferens
    • Rhythmic contractions begin
    • Feeling of ejaculatory inevitability
  • Expulsion stage
    • Rapid contractions
    • Semen spurts from urethral opening
  • Orgasm
    • Intensely pleasurable physical sensations that usually accompany ejaculation
    • Followed by refractory period
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