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Sexual Behavior

Sexual Behavior. Sex Research History. Kinsey Masters & Johnson. Kinsey: Large Scale Sexuality Research Begins in the U.S. Most influential modern sexuality researcher Atheoretical in the beginning because data on sexuality was lacking

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Sexual Behavior

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  1. Sexual Behavior

  2. Sex Research History • Kinsey • Masters & Johnson

  3. Kinsey: Large Scale Sexuality Research Begins in the U.S. • Most influential modern sexuality researcher • Atheoretical in the beginning because data on sexuality was lacking • He and 3 colleagues interviewed 18,000 subjects to obtain sexual life histories • 1947, established the Institute for Sex Research

  4. The Kinsey Reports • Found many “unacceptable” activities to be widely practiced

  5. Masters & Johnson and Scientific Sex Research

  6. Masters & Johnson’s Sexual Response Cycle • 4 Phase Sexual response cycle • Excitement phase: erection, lubrication, muscular tension, ^ heart rate, sex flush • Plateau phase: advanced state of arousal, orgasmic platform builds, sex skin appears • Orgasmic phase: 3-15 contractions, rush, warmth, explosion, release • Resolution phase: return to prearoused state, men have refractory period unresponsive to stimulation, women may be rearoused to multiple orgasm

  7. Female Sexual Response Cycle

  8. Male Sexual Response Cycle

  9. Sexual Dysfunctions • Erectile dysfunction (impotence) is most often caused by physical problems such as blood vessel disease • Premature ejaculation may result from anxiety or oversensitivity • Hypoactive sexual desire occurs in both sexes and has physical and psychological causes • Vaginismus is a female disorder in which the lower portion of the vagina contracts involuntarily at anticipation of penetration. It has physiological and psychological causes

  10. Homosexuality

  11. Homosexuality:Some Useful Distinctions 1. homosexual orientation 2. homoerotic behavior 3. male and female same-sex sexual orientation 4. individual differences within these broad categories

  12. Primary Sexual Orientation • Males: 96 – 98% heterosexual 2 – 4% homosexual • Females: 98 – 99% heterosexual 1 – 2% lesbian

  13. Male and Female Mating Strategies • Do males and females differ in their mate preferences and mating strategies?

  14. Seeking sex with strangers in Florida

  15. Anisogamy • The sex with the larger gamete is the female, by definition • Females begin with the bigger investment in the offspring • Often, especially in mammals, females also continue with greater parental investment after the offspring is born

  16. Anisogamy • If one sex has great parental investment per offspring: - selection for parental effort - choosy about mating

  17. Parental Investment and Sexual Selection • A. high investing sex as a limited resource

  18. B. competition among low investing sex

  19. C. choosiness among high investing sex

  20. The sex with low parental investment per offspring • selection for mating effort • less choosy about mating

  21. Men’s Reproductive Success… • …is only limited by the number of fertile females they have intercourse with

  22. Male Sexual Psychology

  23. Testis (and penis) Size

  24. Testicle Size in Primates • Sperm competition can be inferred in groups with multiple males, who also have larger relative testicles

  25. Sperm Motility • The midpiece of the sperm determines swimming speed and power • In species with more promiscuous mating strategies, the midpiece is larger • Sperm competition

  26. SpermCompetition

  27. The Coolidge Effect

  28. Ideal Number of Sex Partners Desired

  29. Likelihood of Intercourse after Various Time Intervals

  30. Female Sexual Psychology

  31. Women’s reproductive success… • …is not helped by having multiple sexual partners

  32. Male and FemaleMating Strategies

  33. Location of 37 Cultures in the International Mate Selection Project

  34. Mating Preferences Preferences that are similar among the two sexes: • Mutual attraction-Love • Exciting personality • Healthy • Pleasing disposition • Kindness & understanding • Education & Intelligence • Sociable • Refinement-Neatness • Wants children • Easy going • Creative & artistic

  35. What do men want?(that women don’t care as much about) • Attractiveness • Youth • Clear skin • Waist to hip ratio • Breasts

  36. What do women want?(that men don’t care as much about) • Resources/good financial prospects • Willingness to invest in her and their future children • Education • Status • Career • Ambition

  37. Good Financial Prospects

  38. Good Financial Prospects

  39. Looks vs. Money

  40. Age preferences and marital patterns: men do marry younger women

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