It is thought that different views on the taboos of Buddhism, Shinto and Taoism as above were syncretized in medieval times, and that the basic idea of present Nyonin Kinsei and Nyonin Kekkai was established led by mountain temples and Shugen-do around the Kamakura period.
上記の仏教と神道、道教などの異なるタブー観が、中世に習合し、山岳の寺院、修験道などを中心として、鎌倉時代ごろに今の女人禁制、女人結界のベースとなる観念が成立したものと考えられている。