The document summarizes male sexual anatomy and physiology. It describes the external structures of the penis and scrotum. Internally, it outlines the testes, epididymis, vas deference, seminal vesicles, prostate gland, and urethra. Male sexual response involves erection through blood flow, ejaculation in two stages of emission and expulsion, and the orgasm sensation. Hormones like testosterone regulate functions like sperm and muscle production.

1. Male Sexual Anatomy, Physiology, and Response

2. 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

4. External Structures
 The penis
 The scrotum

5. 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

6. 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: a tube that transports urine and semen
 When penis erect, urinary duct is blocked

7. 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

10. What is a normal penis?

11. Penile Widening

12. Glanular Enhancement

13. Penile Lengthening

14. Other Procedures
 Curvature Correction
 Circumcision

15. 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

16. Internal Structures
 Testes:
 Two major functions: sperm and hormone
production
 Shaped like olives; 1.5” long and 1” diameter.
 Size and weight decrease as men age
 Not usually symmetrical in the way they hang
 Suspended by spermatic cord
 Within each testicle, there are about 1000
Seminiferous tubules: Production of sperm
takes place in these tubes

18. Internal Structures
 Epididymis
 C shaped structure on the back of the teste
 Sperm mature in vas deferens
 Vas Deferens
 The ducts that carry sperm from testicles to
urethra for ejaculation
 Vas deferens joins the ejaculatory duct within
prostate gland

20. 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

21. Other structures
 Breasts
 gynecomastia
 Anus
 Buttocks
 Rectum

22. Male Sexual Physiology
 Production of hormones
 Spermatogenesis

23. 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

24. Spermatogenesis
 Ongoing process from puberty onward
 Sperm produced within seminiferous tubules
of testicles (64-72 days)
 Several 100 million sperm produced daily
 20 days for sperm to travel through epididymis
 During this time they become fertile and motile
 Upon ejaculation, sperm expelled through
urethra by muscular contractions

26. 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

27. 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