In an advanced civilization, as we see, these ideas having their ultimate basis on the old story of the serpent, and on a special and mysterious connection between the menstruating woman and the occult forces of magic, tend to die out. The separation of the sexes they involve becomes unnecessary. Living in greater community with men, women are seen to possess something, it may well be, but less than before, of the angel-devil of early theories. Menstruation is no longer a monstrific state requiring spiritual taboo, but a normal physiological process, not without its psychic influences on the woman herself and on those who live with her.
Several recent works, however, notably Frazer's Golden Bough and Crawley's Mystic Rose, throw light directly or indirectly on this question.
Robertson Smith points out that since snakes are the last noxious animals which man is able to exterminate, they are the last to be associated with demons. They were ultimately the only animals directly and constantly associated with the Arabian jinn, or demon, and the serpent of Eden was a demon, and not a temporary disguise of Satan (Religion of Semites, pp. 129 and 442). Perhaps it was, in part, because the snake was thus the last embodiment of demonic power that women were associated with it, women being always connected with the most ancient religious beliefs.