BIO SCI 75 Lecture Notes - Lecture 8: Vasocongestion, Foreplay, Sexual Stimulation

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Excitement: sexual arousal, foreplay, vasocongestion (sex flush), erection, increase heart rate and blood pressure. Orgasm: peak intensity, rhythmic muscle contraction, ejaculation (male) Male sexual response: excitement: vasocongestion especially in penis to produce erection, scrotum thickens, testes pulled up, increase blood pressure and heart rate, sometimes sex flush in breast, shoulder, abdomen, plateau: peak vasocongestion of penis, glans swells, testes swell, Physiological: erectile dysfunction (determined by measuring penile tumescence at night) Barrier methods: external physical barrier: condoms male and female versions, very reliable but can fail usually due to incorrect use, prevent disease. Internal physical barrier: diaphragms, cervical gap: chemical: spermicides. Iud, intrauterine device: t shaped device inserted into uterus by physical left in place. Mechanism: stimulates inflammatory response, may interfere with sperm and egg transport or prevent implantation. Hormonal contraceptives: estrogen + progesterone: suppresses gonadotropins so prevents ovulation; menstruation occurs. Combination pill; 21 days constant level then none.