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Lecture 2

Week 20 Sexual Orientation.docx

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Health Sciences
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Madeline Law

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Week 20: Sexual Health CHSC 1F90 Tuesday, 04 March 2014 Luanne Jamieson Early sex researcher- Freud Sigmund Freud (1856-1939)  Physician in Vienna, Austria  Founder of psychiatry and psychoanalysis Henry Havelock Ellis (1859-1939)  Physician in England  Compiled a large collection of information on sexuality (medical, anthropological findings and case histories) in a series of volumes called Studies in the Psychology of Sex (1896)  Desired to collect info about human sexuality rather than make judgments about it Magnus Hirschfeld (1868-1935)  German physician and sexologist  Founded first sex research institute  Administered the first large-scale sex survey (n=10,000)  Established first journal devoted to sex  Credited with founding the German homosexual rights movement Alfred Kinsey (1894-1956)  American biologist  Sex surveys: Data collected on sex histories in face-to- face interviews (5,300 males and 5,940 females)  Findings published in 2 books called the Kinsey Reports: Sexual Behaviour in the Human Male (1948) | Sexual Behaviour in the Human Female (1953) William Masters (1915-2001)  American Ob-gyn and sexologist Virginia Johnson (1925-2013)  Night club singer hired as a Research Assistant; became a sexologist  Measured human sexual behaviour in the lab (1954) (n=694)  electrocardiograph (heart rate over the sexual cycle); eletromyograph (muscular contractions in the body during sexual response); pH meter (acidity of the vagina during the stages of sexual response **Clicker questions** Which sex researcher studied sex behaviour in lab? Masters and Johnson Week 20: Sexual Health CHSC 1F90 Tuesday, 04 March 2014 Stages of Sexual Response 1. Excitement 2. Plateau 3. Orgasm 4. Resolution  Most of what we know about sexual response is based on Masters and Johnson’s research Physiological Processes in Sexual Response Two basic physiological processes:  Vasocongestion  Blood vessels in a region (genitals) dilate, and as a result, a lot of blood flows into the blood vessels  Myotonia  Occurs when the muscles contract in the genitals and throughout the body Stage 1 - Excitement Stage  Beginning of erotic arousal – increase in blood pressure and pulse rate  Men  Erection begins (a few seconds)  Nipples become erect (occurs in many men)  Testes pull closer to the body  Sex flush on the skin  Women  Vaginal lubrication begins (10 – 30 seconds)  Nipples become erect  Swelling of the tip of the clitoris  Breasts swell  Inner labia swell  Sex flush on the skin Stage 2 – Plateau Stage  Blood pressure, pulse rate and breathing increase even more.  Vasocongestion reaches its peak  Men  Penis is completely erect  Fluid appears at the tip of the penis (can contain active sperm)  Scrotum thickens  Testes are are pulled up higher and closer to the body  Women  Orgasmic platform forms - Vaginal entrance becomes smaller (increase in gripping during penetration)  Clitoris retracts up into the body  Top third of the vagina expands Week 20: Sexual Health CHSC 1F90 Tuesday, 04 March 2014 Stage 3 – Orgasm Stage  Men and Women  Sharp increase in pulse rate, blood pressure and breathing rate   Orgasm for males and females is a series of rhythmic  contractions at 0.8 second intervals (in pelvic region or orgasmic  platform)  Muscles contract – face may contort into a grimace, muscles of  the arms, legs, thighs, back, buttocks contract, feet and hands may  contract (curl) as well  Men – Ejaculate  Women – Ejaculation in some women  No tangible evidence of an orgasm  Women do not reach orgasm as quickly as men **Clicker Questions** Men and women experience a similar process when they have an orgasm. YES Which of the following is NOT one of the four stages of human sexual response?  Provocation Stage 4 – Resolution Stage  Body returns physiologically to the unaroused state  Takes about 15­30 minutes  May take 1 hour in women who did not have an orgasm  Gradual return of pulse rate, blood pressure and breathing rates  Men lose the erection in their penis and enter a refractory period  Refractory Period – incapable of being aroused, having an  erection, or an orgasm (happens in most men)  Can last from a few minutes to 24 hours  Women do not have a refractory period, so they can have  multiple orgasms Measurement Devices in Sex Research  Obtain objective measures of physiological levels of arousal to erotica  (sexually arousing pictures, movies, stories):  Penile Strain Gauge (men)  Photoplethysmograph (women)  Both devices measure vasocongestion in the genitals  Devices measure how aroused a person actually is to erotic material  More effective than self­report of arousal DO you think that women are sometimes unaware of their own physical arousal to erotic  materials? YES tis true  Men know they are aroused because it is pretty hard to miss a erection.  Which of the following devices to measure female arousal in the lab?  Photoplethysomoth  Week 20: Sexual Health CHSC 1F90 Tuesday, 04 March 2014 People can tell they are attracted by the length of men’s fingers.   Attractiveness and the 2D:4D Ratio
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