There are three important models that explain human sexual response: 1) Masters and Johnson's model has four phases: excitement, plateau, orgasm, and resolution. 2) Kaplan's Triphasic Model has three phases: sexual desire, excitement, and orgasm. 3) Joanne Loulan's Sexual Response Model has six phases: willingness, sexual desire, excitement, engorgement of tissue, orgasm, and pleasure.

1. Human Sexual Response Models.html
Human Sexual Response Models
There are three important models that explain the human sexual
response.
As you learned last week, Masters’ and Johnson’s model has
four components:The excitement phase: During this stage, the
person gets sexually aroused.The plateau phase is characterized
by complete arousal prior to orgasm.The orgasmic phase
considered the peak of the sexual activity, is characterized by
orgasm.The resolution phase is the phase after orgasm, which i s
characterized by a relaxation of muscles, mostly accompanied
by a refractory period.
Kaplan's Triphasic Model has three components:Sexual desire:
This phase has been defined as an appetitive state—an innate
psychological drive for sexual intimacy. During this stage,
people get a warm, fuzzy feeling and become psychologically
interested in sex before any physical bodily changes
occur.Excitement: Also referred to as the "vasocongestion of
genitals" phase, this phase is marked by the beginning of
arousal in response to physical stimulation, psychological
stimulation, or both. This phase may last for minutes or for
hours. As the vasocongestion of genitals continues, men
experience an erection and women experience
lubrication.Orgasm: During an orgasm, both sexes experience a
series of rhythmic, involuntary contractions along with highly
pleasurable feelings. Orgasms typically last a few seconds,
often accompanied by ejaculation in men and, sometimes, in
women.
Joanne Loulan's Sexual Response Model has six
components:Willingness: This phase involves the mere mental
decision to have sexual intercourse.Sexual desire: During this
phase, there may be no noticeable physiological changes but the

2. person feels sexually aroused.Excitement: Excitement leads to
increased heart rate and blood pressure.Engorgement of tissue:
Like Masters’ and Johnson’s plateu phase, is characterized by
complete arousal prior to orgasm.Orgasm: This is the equivalent
of Masters and Johnson's orgasmic phase.Pleasure: This is the
equivalent of Masters and Johnson's resolution phase.
Attitudes Toward Sexuality.html
Attitudes Toward Sexuality
When you studied the history of sexuality last week, you
learned about how Victorian attitudes toward sexuality have had
a profound influence in shaping contemporary sexual attitudes.
Western cultural attitudes toward sexuality were greatly
influenced by religious attitudes. For example, one attitude
forbids sex outside of marriage, or sexual activity between
members of the same sex.
The mass media is another factor that influences attitudes
toward sexuality. Films, music, and television all influence
human attitudes toward sexuality. Cognitive social learning
theory suggests that men and women internalize messages
(schema's) as acceptable standards for gendered sexual
behavior. Sex is reported to be the most frequently searched
topic on the Internet, and cybersex is a remarkably common
activity for Internet users.
To explore human attitudes toward sexuality, begin with
exploring your own attitude toward pornography and sexual
fantasies.
Male Sexual Anatomy.html
Male Sexual Anatomy
View a PDF transcript of Male Sexual Anatomy

3. media/transcripts/Week2/SU_PSY4040_W2_L2_G1.pdf
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Male Sexual Anatomy
An Anterior View of the Male Reproductive System
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An Interior View of the Male Reproductive System
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Spermatogenesis
Spermatogenesis is the process of sperm production. It begins at
the outermost cell layer in seminiferous
tubules and proceeds toward the lumen.
Functions of Male Glands
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The functions of male glands are:
Activating spermatozoa
Providing the nutrients the spermatozoa need for motility
Propelling the spermatozoa and fluids along the reproductive
tract (mainly by peristaltic
contractions)

5. Producing buffers to counteract the acidity of urethral and
vaginal environments
Male Reproductive Functions
Female Sexual Anatomy.html
Female Sexual Anatomy
View a PDF transcript of Female Sexual Anatomy
media/transcripts/Week2/SU_PSY4040_W2_L3_G1.pdf
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Female Sexual Anatomy
The Female Reproductive System
A Posterior View of Ovaries

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The ovaries are small, almond-shaped organs near the lateral
walls of the pelvic cavity. Their functions
include:
Production of immature female gametes (oocytes)
Secretion of female sex hormones (estrogens and progestins)
Secretion of inhibin, involved in the feedback control of the
pituitary follicle stimulating hormone
(FSH)
Oogenesis
Oogenesis, also known as ovum production, begins before birth,
accelerates during puberty, and ends at
menopause.
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Uterus
The uterus nurtures the developing embryo (one to eight weeks)
and fetus (nine weeks through delivery).
The uterus facilitates:
Mechanical protection
Nutritional support
Waste removal
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The Uterine Cycle (or Menstruation Cycle)
The uterine cycle involves the degeneration of the functional
zone. It:
Occurs in patches
Happens because of the constriction of spiral arteries, reducing
blood flow, oxygen, and nutrients
Causes weakened arterial walls to rupture, releasing blood into

8. the connective tissues of the
functional zone