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Unformatted text preview: Refractory- only seen in males, can't become stimulated in erection ○ Masters and Johnson- excitement, plateau, orgasm, resolution • Scrotum pulled closer to body, testes begin to elevate ○ Vasocongestion-pooling of blood and genital tissue causes erection ○ Nipples may harden and become erect ○ Increase Hr, Bp, myotonia- muscle tension all over body ○ Sex flush- changing of coloring of upper body- face and neck ○ Excitement: • Penis fully erect; testes swell and further elevate ○ Cowper's gland secretion- preejaculate fluid ○ Glans deepen in color, coronal ridge increases in diameter ○ Prostate enlarges ○ Takes amount of time for blood to flow out of penis- blue balls Women experience similar- time takes for blood to flow out of vagina longer than it did for orgasm If stimulation withdrawn before orgasm- resolution phase ○ Plateau • Next class ○ Sexual arousal and cocaine cravings activate similar areas of brain- indicates they both stimulate reward areas of brain ○ Brain Activation During Arousal • Orgasm and ejaculation are two different things-most go together but not always ○ First part of orgasm- contraction of vas, seminal vesicles, prostate forces ejaculate into bulb at base of urethra Once this has happen they lose ability to control ejaculation Internal sphincter of the bladder closes so semen doesn’t enter bladder Emission stage: ○ Contraction of muscles at base of penis begin rhythmic Expulsion stage: ○ Vagina very acidic- nearly 1/4 die Once sperm enters vagina it coagulates Sperm only viable or able to fertilize for 28 to 30 hours Numerous barriers between egg and sperm- high percentage of defective sperm, and the vagina's hostile acid environment, women's own defense system attacks the sperm and destroys them Some try to fertilize first round object they find Provide tiny channels lesss then 1/100th of a mm wide making it closer for sperm to find their goal □ Many don't find mucin and die but the ones that do survive □ Swim in dense bunches to protect inner ones from acidity and defense systems □ Cervix secretes mucin- fluid protein which is very liquid during ovulation to make it easy for the sperm to live in Video, (miracle of life): ○ Last stage in process for men Vasocongestion and myotonia reversed Erection lost, scrotum and testes return to normal Pulse and breathing rate return to normal Take about 15 - 30 minutes if orgasm occurs if it doesn't it takes up to an hour Hugely variable between men- few minutes to 24 hours □ Refractory period- cannot attain subsequent orgasm No refractory period in women which is why they are able to have multiple orgasms Resolution: ○ Male orgasm- emission • A.) persistent or recurrent inability to attain or maintain erection until completion of the sexual activity an adequate erection B.) causes marked distress or interpersonal difficulty Lifelong vs. Acquired, Generalized vs. situationalLifelong vs....
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- Spring '10
- Sexual intercourse, Penis, Sexual arousal, Orgasm, Erection