Sexuality Study Guide

📖 Core Concepts Human sexuality – integrates biological, psychological, social, and spiritual dimensions of sexual feelings and behaviors. Sexual orientation – enduring pattern of romantic/sexual attraction (hetero, homo, bi, asexual). Gender identity – internal sense of being male, female, or non‑binary, which may differ from sex assigned at birth. Sexual response cycle (Masters & Johnson) – Excitement → Plateau → Orgasm → Resolution (EPOR). Reproductive anatomy – Male: penis, testes, epididymis, vas deferens, seminal vesicles, prostate, Cowper’s glands. Female: vulva, vagina, uterus, cervix, fallopian tubes, ovaries. Hormonal regulation – Hypothalamus → pituitary → oxytocin, prolactin, FSH, LH. LH surge → ovulation (day 14). Sexual dysfunction – disturbance in desire, arousal, orgasm, or pain that causes distress. Sex education models – Abstinence‑only vs. comprehensive (includes contraception, consent, healthy relationships). Reproductive & sexual rights – legal/ethical entitlement to decide about one’s body, partners, and reproduction. 📌 Must Remember LH surge on day 14 triggers ovulation of the Graafian follicle. FSH stimulates follicle growth (women) and sperm production (men). Oxytocin released during orgasm → bonding; also during childbirth & breastfeeding. Fraternal birth‑order effect: more older brothers ↑ odds of male homosexuality. Kin‑selection hypothesis: homosexual individuals may increase inclusive fitness by aiding relatives. Erection mechanism: corpora cavernosa fill with blood; scrotum cools testes. Resolution phase includes a refractory period in men (lengthens with age). Comprehensive sex ed → higher contraceptive use; does not increase teen sexual activity frequency. U.S. v. One Package (1936) allowed physicians to prescribe contraception, reducing stigma. ACA (2010) mandates coverage of all contraceptive methods in marketplace plans. 🔄 Key Processes Female menstrual cycle Menstruation (days 1‑4): low estrogen/progesterone, endometrium shedding. Follicular phase (days 5‑13): ↑FSH → follicle growth → estrogen rise → endometrial thickening. LH surge (day 14): ovulation of mature follicle. Luteal phase (days 15‑28): corpus luteum secretes progesterone (and estrogen) → prepares endometrium. If no fertilization: corpus luteum regresses → hormone drop → next menstruation. Male sexual response (EPOR) Excitement: spinal reflex → penile erection, increased HR, scrotal thickening. Plateau: maximal penile girth, Cowper’s gland pre‑seminal fluid. Orgasm: emission (contraction of vas deferens, prostate, seminal vesicles) → expulsion (ejaculation). Resolution: refractory period, vasoconstriction, return to baseline. Ejaculation sequence Emission → contraction of vas deferens → prostate & seminal vesicles add fluid → sperm travel to urethra → rhythmic pelvic floor contractions expel semen. 🔍 Key Comparisons Abstinence‑only vs. Comprehensive education Abstinence‑only: promotes no sexual activity until marriage; omits contraception info → leaves teens unprepared. Comprehensive: includes contraception, consent, STIs; proven to increase safe‑sex practices without raising activity rates. Innate vs. Social theories of sexual orientation Innate: genetic, prenatal hormone, fraternal birth‑order – evidence favours these, especially in males. Social: cultural tolerance → no consistent increase in prevalence; less empirical support. Kin‑selection vs. Sexually antagonistic gene hypotheses Kin‑selection: homosexuals boost relatives’ reproductive success. Sexually antagonistic: same genes increase female fertility while causing male homosexuality. ⚠️ Common Misunderstandings “Tolerance raises homosexuality rates.” – Cross‑cultural data show prevalence is stable regardless of tolerance. “All men have a refractory period, all women do not.” – Women can experience a brief refractory‑like period but it is typically much shorter; not absent. “Comprehensive sex ed encourages teen sex.” – Evidence shows it does not increase frequency of sexual activity, only safer practices. “All religious traditions uniformly condemn homosexuality.” – Contemporary movements within Judaism, Christianity, and Islam show a spectrum of interpretations. 🧠 Mental Models / Intuition “Hormone cascade as a relay race.” – Hypothalamus → pituitary → peripheral glands (ovaries/testes); each runner passes the baton (hormone) to trigger the next stage. “EPOR as a four‑stage climb.” – Excitement (start), Plateau (steady climb), Orgasm (summit), Resolution (descent). “Sex education spectrum.” – Visualize a line: left = abstinence‑only (no tools), right = comprehensive (full toolkit). 🚩 Exceptions & Edge Cases Premature ejaculation – can occur without physiological dysfunction; often linked to anxiety. Retrograde ejaculation – semen redirected to bladder; may be medication‑induced. Menopause – drastically lowers estrogen → alters vaginal lubrication and libido. Hormonal contraceptives – can suppress LH surge, preventing ovulation despite normal FSH patterns. 📍 When to Use Which Diagnosing male sexual dysfunction: Erectile issues → evaluate vascular, neurological, psychological factors. Premature ejaculation → consider behavioral therapy first; pharmacologic agents if needed. Choosing contraception counseling: Desire for pregnancy prevention & menstrual regulation → combined oral contraceptives. Preference for non‑hormonal → copper IUD or condoms. Sex education approach for a community: If cultural/religious constraints limit discussion of contraception → integrate abstinence messaging plus factual STI info (harm‑reduction). In settings with high teen pregnancy/STI rates → prioritize comprehensive curriculum. 👀 Patterns to Recognize Hormone‑symptom pairing: Rising estrogen → breast/uterine changes; rising LH → ovulation; rising progesterone → luteal phase symptoms. STI risk clusters: Adolescents (15‑24) account for >50 % of new infections → red flag for targeting education. Sexual dysfunction presentation: Desire disorder often co‑occurs with mood disorders; arousal disorder ↔ vascular issues; orgasmic disorder ↔ neurological or psychological factors. 🗂️ Exam Traps Distractor: “Tolerance of homosexuality increases its prevalence.” – Wrong; prevalence remains stable across tolerant vs. intolerant societies. Distractor: “Comprehensive sex education raises teen sexual activity.” – Evidence shows it does not; it improves safe‑sex behaviors. Distractor: “All men have a permanent refractory period after orgasm.” – Length varies with age; some men may have a very short or negligible period. Distractor: “FSH only affects women.” – Incorrect; FSH also stimulates spermatogenesis in men. Distractor: “The fraternal birth‑order effect explains female homosexuality.” – The effect is documented primarily for males. --- Use this guide for rapid recall before your exam – focus on the bolded facts, the stepwise cycles, and the contrasting pairs.