Human Sexual Behavior

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Human Sexual Behavior
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Part I

• Sexologists have developed many models to
  describe how humans respond sexually
• Models are descriptions and diagrams that
  summarize data from sex research studies
• However remember Principle 1 With the enormous
  variety of sexual response, nothing is ever 100.
• The three most quoted models were developed by
• Masters Johnson
• Kaplan
• Loulan
• Table 3.2 (page 100)

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1966 Masters Johnson 4-Stage Sexual Response
Cycle

• Direct observation of 10,000 orgasms
• 694 subjects. Self-selected. 18-89 years old.
• Clinical laboratory observations
• Medical equipment used to monitor changes during
  sexual arousal and orgasm
• 4 Stages
• Excitement
• Plateau
• Orgasmic
• Resolution

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Photoplethysmograph for females
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Male Plethysmograph Ch. 2
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1979 Kaplan 3-Stage Model

• Helen Singer Kaplan (sex therapist author)
• 3 Stages
• Desire (psychological component)
• Excitement (Combined MJ excitement plateau)
• Orgasm
• Desire Requires some form of erotic thought,
  therefore involves the brain.

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DESIRE Thoughts, Fantasies, Erotic Feelings

• Cerebral Cortex
• Limbic System
• Nervous system (erogenous zones)
• Endocrine system (glands and the hormones they
  produce)

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1980 Loulan 6-Stage Sexual Response Model

• Willingness (with or without desire)
• Desirethought, fantasy or erotic feeling
• Excitement
• Engorgement of tissues
• Orgasm
• Pleasure

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Sexual Desire Eroticism

• Page 206
• Barry McCarthy, 1995
• 5 Components
• Take time to think about it (sexual anticipation)
• Take responsibility for your own sexuality
• Feel deserving of sexual enjoyment
• Recognize how broad and diversified
  responsiveness really is. Orgasm is only part of
  sexual pleasure
• Emotional intimacy is building block for healthy
  sex

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Sexual Desire Eroticism

• Psychological Factors in sexual arousal
• Horny vs. romantic feelings
• 1970-80 studies. Erotic vs. romantic films
• Sexual arousal more pronounced in sexually
  explicit films
• Arousal lower in films with attachment, love,
  romance themes.
• Data from controlled laboratory conditions. Do
  responses apply to the real world?

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Hite Report Sex Emotions

• Overwhelmingly, women wanted sex with feeling
• I despise the attitude that sexual liberation
  means a woman will simply put out.
• I feel very angry when I more loving to men than
  they are to me.
• I hate waking up the next morning with a man who
  changed since we had sexhe really doesnt care
  about me.
• My greatest displeasure is feeling that Im a
  substitute for his hand, a dish of mashed
  potatoes, or some warm place he can stick it in.

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Two fundamental physiological responses in sexual
arousal

• MYOTONIA
• Muscle tension
• Flexing, involuntary contractions, spasms
• VASOCONGESTION
• Engorgement by blood vessels
• Cavernosa tissues in Penis Clitoris, Crura and
  Vestibular Bulbs
• Sex flush chest, breasts, cheeks

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FEMALE
MALE
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SEX FLUSH
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Masters Johnson SEXUAL RESPONSE CYCLE

• Significant variation measured
• Length of time for each phase
• Intensity of response
• BUT, same general pattern developed regardless of
  method of stimulation
• Masturbation
• Oral
• Intercourse
• Fantasy (cerebral)

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William Masters Virginia Johnson

• 1960-1980s
• Objectivity is the goal. Completely remove human
  involvement.
• 1966 Human Sexual Response
• 1970 Human Sexual Inadequacy
• 1979 Homosexuality in Perspective
• 1988 Heterosexual Behavior in the Age of AIDS

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Male Sexual Response Cycle
Refractory Period
TIME
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FEMALE SEXUAL RESPONSE CYCLE
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EXCITEMENT PHASE

• Myotonia
• Vasocongestion
• Increased heart rate
• Increased blood pressure
• Sex Flush (chest, breasts)
• Duration
• 1 minute
• Several hours

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• FEMALE
• Clitoral shaft increases in length
• Labia majora separate
• Labia minora enlarge and become colored

• MALE
• Flaccid to full erection
• Testes elevate
• Scrotum skin thickens due to muscle tensing

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Female Excitement Phase
External
Internal
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Male Excitement Phase
(Flaccid)
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Plateau PhaseRate of increase diminishes for all

• Continued myotonia
• Continued vasocongestion
• Continued increase heart rate
• Continued increase in blood pressure
• Duration
• Few seconds
• Several minutes

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• FEMALE
• Orgasmic platform forms (outer 1/3 of vagina)
• Clitoris retracts under hood
• Labia minora color deepens

• MALE
• Corona fully engorged and flares
• Testes elevate
• Loss of erection unlikely

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Female Plateau Phase
External
Internal
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Male Plateau Phase
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Orgasmic PhaseIn both sexes

• 3-15 rhythmic, coordinated muscle contractions
• Frequency of contractions is 0.8 sec
• Pupil dilation

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• FEMALE
• Clitoris retracted
• Rhythmic contractions of the orgasmic platform
• Rectal sphincter contraction

• MALE
• Emission expulsion of semen
• Rhythmic contractions of muscles in urethra
  base of penis
• Rectal sphincter contraction

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Female Orgasmic Phase
Internal
External
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Male Orgasmic Phase
Emission
Expulsion
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Resolution Phase

• Myotonia reversal
• Vasocongestion reversal
• Heart rate reduction
• Blood pressure drop

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• FEMALE
• Clitoris descends
• Labia majora return to unarousal position
• Labia minora return to unaroused color

• MALE
• Gradual erection loss
• Testes descend
• Scrotal muscles relax. Scrotum thins

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Female Resolution Phase
External
Internal
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Male Resolution Phase
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CPS Review Questions