What is the primary basis for determining a person's sex?

The primary basis for determining a person's sex is physical body characteristics. This refers to the biological and physiological traits typically associated with being male or female, such as chromosomes, hormone levels, and reproductive/sexual anatomy. These characteristics are generally used to classify individuals as male or female at birth, forming the basis of the biological understanding of sex.

While internal sense of gender, social norms, and cultural beliefs play important roles in shaping a person's gender identity and expression, they do not serve as the foundational basis for defining biological sex. Gender, as a social construct, can differ significantly from one's biological characteristics, but sex, as determined by physical attributes, is rooted in biological science and anatomy.