PSYC 5 Lecture 6: Psyc 5 - Psychological Aspects of Human Sexuality - 6

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30 Dec 2020
Department
Course
Professor
Jeff Koo
Psyc 5
Psychological Aspects of Human Sexuality
Summer 2018
4 Units
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 Excitement
o Plateau
o Orgasm
o Resolution
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
these muscles.
The penis cannot be broken, but the albuginea can be injured.
Anatomic nervous system
o Sympathetic
Excitement and fight or flight response.
Keeps it contracted, the smooth muscles are contracted.
o Parasympathetic
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
the urethrae.
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