3 Sexual MotivationSex is a physiologically based motive, like hunger, but it is more affected by learning and values.
4 Sexual Response Cycle Refractory Period Masters and Johnson (N= 382 f and 312 m) the four stages of sexual respondingexcitementplateauorgasmresolutionRefractory Periodresting period after orgasm, during which aman cannot achieve another orgasm
5 Sexual Disorder…a problem that consistently impairs sexual arousal or functioningCan include:lack of motivation, arousalPremature ejaculation (men)Erectile dysfunction (men)Orgasmic dysfunction (women)Treatments:Sexual therapyMedication
6 Estrogena sex hormone, secreted in greater amounts by females than by malesin nonhuman females, levels peak during ovulation, promoting sexual receptivity
7 Testosterone most important of the male sex hormones both males and females have itextra testosterone in males:stimulates growth of sex organs in the fetusdevelopment of the male sex characteristics during puberty
10 Sexual Orientation an enduring sexual attraction toward: members of one’s own sex (homosexual orientation)Members of the other sex (heterosexual orientation)
11 Brain DifferencesOn the average (the evidence is strongest for males), various biological and behavioral traits of gays and lesbians fall between those of straight men and straight women.
12 Brain DifferencesOne hypothalmic cell cluster is larger in straight men than in women and gay men, same difference is found in male sheep displaying other-sex versus same-sex attraction.Anterior commissure is larger in gay men than in women or straight men.
13 Genetic InfluencesShared sexual orientation is higher among identical twins than among fraternal twins.Sexual attraction in male fruit flies can be genetically manipulated.
14 Prenatal Hormonal Influences Altered prenatal hormone exposure may lead to homosexuality in humans and other animals.Men with several older brothers are more likely to be gay.
15 Brain differences and prenatal influences may contribute to observed gay-straight differences in childrens’:Spatial abilitiesRelative finger lengthsFingerprint ridge countsGender nonconformityAuditory systemAge of male pubertyHandednessMale body sizeOcupational preferences