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With the introduction of Buddhism, one of the earliest forms of non-heterosexuality documented in Japan is found in young male homosexual practices during the Heian period (745 to 1185). Buddhism came to Japan from China by way of Korea during the Kofun period (300 to 710). Because Buddhist monks lived on steep mountains isolated within their own societies, they developed their own sexual customs. Young boys (age 11 to age 17) called "Tigo" served the monks sexually because female relationships were strictly forbidden.[3]