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Psychology in Modules: Module 33

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York University
PSYC 1010
Rebecca Jubis

Module 33 Page 1 Module 33 Sexual Motivation and the Need to Belong The Physiology of Sex Sexual Response Cycle - the four stages of sexual responding described by Masters and Johnson - excitement, plateau, orgasm and resolution • Gynecologist-obstetrician William Masters and Virginia Johnson recorded physiological responses of volunteers who masturbated or had sex Phase Response 1. Excitement Phase M&W genitals become engorged with blood. W vagina expands and secretes lubricant, breasts and nipples may enlarge. 2. Plateau Phase Breathing, pulse and blood pressure rates continually increase. Penis becomes fully engorged and fluid with live sperm at its tip. Vaginal secretion increases, clitoris retracts and orgasm feels imminent. 3. Orgasm Pulse rates surge from 70-115 BPM. Woman's arousal & orgasm facilitate conception by propelling semen from the penis, positioning the uterus to receive sperm and drawing it further inward. M&W's orgasms very similar. 4. Resolution Phase Body returns to un-aroused state, genital blood vessels release accumulated blood (quickly if orgasm has happened). Refractory Period - a resting period after orgasm, during which a man cannot achieve another orgasm. Sexual Disorder - a problem that consistently impairs sexual arousal or functioning. Ex. Sexual motivation or erectile dysfunction. Estrogens - sex hormones such as estradiol, secreted in greater amounts by females than by males and contributing to females sex characteristics. In nonhuman female mammals, estrogen levels peak during ovulation, promoting sexual receptivity. Around ovulation woman fantasize more about sex with desirable partners, wear more sexually attractive clothing and have slightly higher pitch. Men's testosterone levels increase if around a Module 33 Page 2 woman ovulating Ex. Strippers hourly
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