An example of a primary se x characteristic is gonads, while breasts are an example of a secondary se x characteristic.
Primary se x characteristics are those characteristics which are primarily required in sex-ual reproduction. The production of eggs by the female or sperm by the male is an example of primary se x characteristics. Growth of body hair, development of breasts and deepening of a male's voice are secondary se x characteristics as they are not directly required in reproduction. Therefore, the production of sperm is an example of a primary se x characteristic.
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