1. Chapter Fourteen: Exploring the Origins of Sexuality

2. Biological Bases of Human Sexuality
Genetic basis
XX = female
XY = male
Gonadal basis
Structural development
Male genital development
Female genital development
Biological sexuality and the childhood years
Puberty
Females: Menarche
Males

3. Growth and Development of Sexuality
Figure 14-1 Growth and Development of Sexuality

4. Psychosocial Bases of Human Sexuality
Psychosocial sexuality: Masculine and feminine aspects of sexuality
Gender: Biological basis of sexuality
Gender identity: Recognition of one’s gender
Gender preference: Emotional and intellectual acceptance of one’s own gender

5. Psychosocial Bases of Human Sexuality
Gender adoption: The long process of learning the behavior that is traditional for one’s gender
Gender identification: Achievement of a personally satisfying interpretation of one’s masculinity or femininity
Image source: The McGraw-Hill Companies, Inc./Jill Braaten, photographer

6. Androgyny Blending of both masculine and feminine qualities
Image sources:
Thinkstock Images/JupiterImages
Brand X Pictures/JupiterImages

7. Male Reproductive System
Testes
Sperm development
Interstitial cell-stimulating hormone
Follicle-stimulating hormone
Scrotum
Ducts
Seminal vesicles
Prostate gland
Cowper’s glands
Penis

8. Male Reproductive System
Figure 14-2 The male reproductive system

9. Male Reproductive System
Age-related hormone changes
Male menopause (andropause)
Decrease in level of androgens
Prostate size increases

10. Female Reproductive System
Mons pubis
Labia majora and labia minora
Clitoris
Vestibule
Vagina
Uterus
Fallopian tubes
Ovaries

11. Female Reproductive System
Figure 14-3 The female reproductive system

12. Menstrual Cycle Menstrual phase Preovulation phase
¼ - ½ cup of blood and tissue is sloughed off during a 5-7 day period
Preovulation phase
Lasts about a week
Release of FSH and LH leading to ovulation around day 14
Post-ovulation phase
Build-up of endometrial tissue
Role of progesterone

13. Menstrual Cycle
Figure 14-4 The Menstrual Cycle

14. Related Conditions Premenstrual syndrome (PMS)
Physical and psychological symptoms that recur during the same phase of the menstrual cycle
Premenstrual dysphoric disorder (PMDD)
Severe form of PMS
Fibrocystic breast condition
Excessive secretory activity producing swollen, firm, or hardened tender breast tissue
Amenorrhea
Absence of menstruation
Menopause
Gradual decline in reproductive system function, usually by late 40s to mid 50s

15. Additional Aspects of Human Sexuality
Reproductive sexuality
Related to procreation
Genital sexuality
Nonreproductive use of sex organs (recreation and communication)
Expressionistic sexuality
Cognitive, affective, and behavioral expressions of one’s gender

16. Chapter Fourteen: Exploring the Origins of Sexuality