Sex characteristics are the biological and physical features which differentiate between females and males. There are primary and secondary characteristics. The primary characteristic pertains to the reproductive organs while the secondary develops during puberty, such as body hair and voice changes. In psychology, contemplating sex characteristics sheds light on gender development, identity, and behavior. Alongside, they also affect social perception and self-conception. The difference between biological sex and gender identity aids psychologists in promoting awareness and inclusivity. For example, in males, the ability to grow facial hair is a secondary sex characteristic.
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