PSYC 5 Lecture 6: Psyc 5 - Psychological Aspects of Human Sexuality - 6
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Psychological Aspects of Human Sexuality
The Physiology of Sexual Response
● Up until the DCM 5 in 2013, our idea of what is normal during sexual functioning is based
on the studies done by Masters and Johnson.
Masters and Johnson
● Four stages of sexual response:
o The stages will vary in duration, but generally speaking, orgasm is the shortest stage.
o Bodies always go through the stages in this order.
● Two basic physiological processes that occur during these stages:
o Vasocongestion: congestion of the blood vessels.
o Myotonia: muscular tension.
Male Sexual Response
● Testosterone is the hormone responsible for sexual desire in both men and women.
● Viagra (PDE 5 inhibitors) don’t make an man desire sex. The man has to be sexually
interested and sexually stimulated. Viagra prevents the smooth muscles from going from
dilated to contraction.
● During the excitement phase, the blood rushes into the corpus cavernosum and the spongy
body, which causes vasocongestion
● The smooth muscles are muscles in the penis around the arteries. You have no control over
● The penis cannot be broken, but the albuginea can be injured.
● Anatomic nervous system
▪ Excitement and fight or flight response.
▪ Keeps it contracted, the smooth muscles are contracted.
▪ The bodies calm down, rest and digest.
▪ The smooth muscles are open.
o In order to be engorged by blood one must be in a parasympathetic state. Hence the
reason why men have trouble getting and/or maintaining an erection while anxious.
● During the resting phase, arteries and (main vein - dorsal vein) veins in the penis are open.
● During erections, the arteries dilate until they hit the albuginea, which squishes the veins
shut, meaning the blood gets stuck.
● The Cowper’s gland will secrete a small amount of pre-cum, which neutralize the acid in