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Reproduction is the function that allows the continuity of life and is common to all living beings. In humans, reproduction is sexual, as it is possible by the union of two sex cells: one female, the oocyte, and the other male, the sperm. When the human being is born, we can only identify the sex of the baby by observing its genitals. Thus, we call these organs primary sexual characters – the penis and the vagina. As we grow, our body undergoes changes in its external appearance – secondary sexual characteristics – which in adolescence already allow us to distinguish between girls and boys.
