This document discusses the concepts of sex and gender. It defines sex as the biological and physiological aspects that determine whether one is male or female based on reproductive organs and genes. Gender is defined as the psychological and sociocultural aspects of identifying as masculine or feminine based on one's feelings and the social norms and roles associated with each. While sex is biological and universal, gender is socially constructed and can vary between cultures and over time. The key distinction is that sex is determined by biology and cannot change, whereas gender involves the social and cultural roles associated with each sex.