It is considered that sexual reproduction first appeared about a billion years ago, evolved within ancestral single-celled eukaryotes. The reason for the initial evolution of sex, as well as the factor(s) it has survived to the existing, are still matters of debate. Some of the many plausible theories include: that sex creates variation among offspring, [ ]
http://worldgeographicchannel.com/sex-in-the-ancient-world-ancient-egypts-sex-life-a-documentary-film/
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