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Mating is the pairing of opposite-sex or hermaphrodite organisms. It is usually for sexual reproduction . Some definitions limit the termmating to pairing between animals.

In mating, there are two types of selection (intersexual, intrasexual) and three mating systems (monogamous, polygynous, polyandrous).

In this article we first discuss why sexual reproduction exists, and how differences between males and females affect mating systems. We move on to consider the evolution of mate choice, and。

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