[Home]   PSY 101    [Psychology
                Images]    Motivation II:  Sexuality

 Sexual Motivation & Behavior

A. The Human Sexual Response Cycle

"Masters and Johnson"
William Masters
Viginia E. Johnson
Helen Singer Kaplan
[Masters & Johnson]            Human Sexual Response (1966)

[HSK]         [Kaplan's Sexual Desire Disorders]
(1) Excitement
(2) Plateau
(3) Orgasm
(4) Resolution

(1) Desire
(2) Excitement
(3) Orgasm
[Male Sexual Response

 B. Evolutionary Analyses of Human Sexual Motivation

Robert Trivers' Parental Investment Theory

Gender Differences: Are there such differences in what people actual do?

          • Sexual Activity
          • Mate Preferences (David Buss)
          • Relationship Jealousy (David Buss)

Critiques of Evolutionary Theory

C. The Mystery of Sexual Orientation

Famous     Alfred Kinsey

  Alfred Kinsey (see photo above on right ) 1948 Sexual Behavior in the Human Male

Is sexual orientation a continuum? Or, is there a clear distinction between heterosexual & homosexual?

Kinsey Sexual Orientation Scale

Male genital arousal

Male pupil dilation

Prevalence of homosexuality

LGBT Adult US 2012 estimate

Prevalence of sexual orientation in western culture

1. Environmental Factors do not, of themselves, explain homosexual orientation

  • Gender nonconformity in childhood is predictive of adult homosexual orientation for males, not females
  • Most male homosexuals, though, are not significantly non-conforming ("feminine") in their behavior

2. Biological Factors associated with homosexual orientation

Bottom Line


This page was originally posted on 10/16/03 and last updated on October 19, 2016