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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


  • 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