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- The male reproductive system includes the testes (which produce sperm), penis, epididymis, vas deferens, ejaculatory ducts and urethra.
- The female reproductive system consists of the internal female sex organs including the ovaries (which produce eggs or oocytes), fallopian tubes, uterus, cervix, vagina and the external female genitalia, or vulva As a female matures, the glandular tissue in her breasts become able to produce breast milk for nourish children - whether or not she has given birth. Induced lactation is also known as "adoptive breastfeeding."
(2) SKELETON AND BONE
Males tend to have a larger and more robust skeleton with greater bone development at muscle attachment sites.
(3) MUSCLE AND BODY COMPOSITION
Compared to women, men invariably have more muscle mass and less body fat than women. Women require more body fat for procreation and breast feeding offspring.
Men are stronger than women. In terms of lower body strength, a woman is only 75% as strong as a man. In terms of upper body strength, a woman is only about 55% as strong as a man. Men's greater strength translate to better performance in sports. For example, "greater strength drives difference in power between sexes in the conventional deadlift exercise."
Men have a stronger cardiopulmonary system than women, including a higher maximal oxygen consumption (VO2 max), aka stamina or endurance.
(5) BRAIN ANATOMY - GRAY MATTER
Sex differences in gray matter in the brain anatomy causes cognitive, emotional, and behavioral differences between men and women. In fact, "sex can be reliably predicted by brain structure when considering the brain mosaic as a whole."
Compared to women, men have superior spatial skills and motor (muscle) control, which translates into superior performance in many sports.
(7) MATING, PARENTING, AGGRESSION
There are sex-associated behavioral differences in mating, parenting and aggression. These behaviors have historically been essential for survival and propagation. Sexual aggression is no longer needed to ensure continuation of the species, but nonetheless persists.
(8) SEXUALITY
There are significant differences between men and women in terms of sexual interest and activity. For instance, men have a higher sex drive, think about sex more often, report more frequent sex fantasies and more frequent feelings of sexual desire. Moreover, heterosexual women and lesbians share more commonalities while heterosexual men and gay men share more commonalities.
(9) "men are from mars, women are from venus"
- There are fundamental psychological differences between males and females.
- To emphasize: Heterosexual women and lesbians share more commonalities while heterosexual men and gay men share more commonalities.
(10) HEALTH AND LONGEVITY
In terms of longevity, the X sex chromosome is "superior" to the Y sex chromosome. Hence, other factors being equal, females outlive men.