Features that differentiate male and female bodies but that aren't absolutely necessary for reproduction are called:

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Secondary sexual characteristics are physical features that are not directly involved in reproduction but differ between males and females. Examples include breast development in females and facial hair growth in males. Primary sexual characteristics are the reproductive organs necessary for reproduction, and tertiary sexual characteristics are not commonly used or recognized terms in biology. Secular trends refer to changes in physical characteristics of a population over time, such as increasing height or earlier onset of puberty.

Features That Differentiate Male and Female Bodies but That Aren't