The physical characteristics of men and women exhibit several differences. Men generally have more developed skeletal and muscular systems, while women tend to have higher body fat, giving them a more rounded physique. The pelvis shape also differs, with women's pelvises being adapted for childbirth. In terms of brain structure and function, women are more likely to use both hemispheres equally for language functions, whereas men tend to lateralize to the left hemisphere. Women excel in memory and language learning, while men often outperform in motor skills and task accuracy. Hormonal influences are significant; female hormones affect not only reproductive organs but also muscles, bones, and other organs, leading to increased body fat and the onset of menstruation during puberty. Conversely, men experience increased muscle mass and strength. Health-wise, men are more prone to prostate cancer, while women are more susceptible to uterine cancer and osteoporosis. These differences are determined by biological factors such as genes and hormones and are also influenced by social learning. The structural and functional differences in the brain, including the activity of the amygdala in emotional processing, highlight the complexity of individual variability and the overlap between sex differences and personal traits. These distinctions, shaped by fetal hormone levels and genetic factors, can have lifelong impacts.