Human Sexual Response

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Human Sexual Response
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Sex Roles

• Gender identity
• Masculine
• Feminine
• Androgynous
• Cultural or Genetics
• transsexual

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Human Mating systems

• Polygamy
• Polyandry
• Polygyny
• Monogamous
• Serial
• Life
• Sexual dimorphism

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Sexual Arousal

• Blood pressure elevation of 30-80 mm Hg
• Heart rate elevation to 110-180/min
• Vasocongestion (both skin and deep tissues)
• Respiration elevation to over 40/min
• Anal sphincter contractions
• Muscle contractions (esp. hands and feet)
• Post-orgasmic perspiration

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• Increase in breathing rate
• Increase in blood pressure
• Increase in muscle tone (myotonia)
• Increase in heart rate (tachycardia)
• Vasocongestion of the skin ("sex flush")
• Slight or extreme dilation of the pupils (though
  especially so with females)
• Erection of the nipples (especially upon direct
  stimulation)

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Female Arousal

• Arousal may be accompanied by these physical
  responses to mental and/or physical stimuli
• Vaginal lubrication begins first, within 10-30
  seconds.
• The inner two thirds of the vagina expands.
• The uterus and cervix are pulled upwards.
• The labia majora flatten and spread apart.
• The labia minora increase in size.
• The clitoris increases in size.
• The nipples may become erect as the result of
  muscle contractions.
• When highly aroused the breasts may increase in
  size.

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Male Arousal

• Penile tumescence and erection
• Emission of pre-ejaculatory fluid
• Ascension of the testes
• Tensing and thickening of the scrotum

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• During sexual stimulation
• PNS cause release of NO
• Cause dilation of arteries
• Compress veins of penis (blood accumulates)
• Ejaculation
• Emission and Ejaculatory phase
• Occurs in response to SNS
• Stimulate contractions of smooth muscle
• Urethra fills with semen
• Signal to spinal cord to cause skeletal muscles
  at the base of the penis to contract
• Sequence bulbourethral glands prostate
  sperm cells seminal vesicles
• After SNS causes constrict of arteries (flaccid
  state)

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Female Sexual Response
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Male Sexual Response
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Hormones and Sexual Behavior

• Androgens stimulate sex drive in many mammals
• Eunuchs
• Orchidectomy results in decline in sex drive
• Estrogens responsible for sex drive in many
  female mammals
• In humans androgens play more of a role

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Sexual Dysfunction

• Vaginisimus
• Dyspareunia
• Premature Ejaculation
• Ejaculatory incompetence
• Erectile Dysfunction
• Orgasmic Dysfunction