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Mating may also lead to external fertilization, as seen in amphibians, fishes and plants For most species, mating is between two individuals of opposite sexes. As psychology and science see it, mating is the entire repertoire of behaviors that animals—including humans—engage in the pursuit of finding a partner for intimacy or reproduction Given that reproduction is at the heart of natural selection, decisions about mating are of central adaptive significance. Mating behaviour in animals includes the signaling of intent to mate, the attraction of mates, courtship, copulation, postcopulatory behaviours that protect a male’s paternity, and parental behaviour. Human mating is a fundamental aspect of human existence, encompassing how individuals seek, attract, and form partnerships Fertilization is the fusion of two gametes There are many ideas about human mating systems, varying from culture to culture While some cultures hold the ideal that monogamy is the best mating system for humans, others strictly believe in polygyny, while others yet practice polyandry or promiscuity within their culture. In evolutionary psychology and behavioral ecology, human mating strategies are a set of behaviors used by individuals to select, attract, and retain mates. 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 then. Animal mating systems describe the way in which a group is structured in relation to sexual behavior (who mates with who), in addition to the strength and length of pair bonds.