13Weir, Anthony. "Potency and Sin: Ireland and the Phallic Continuum." Archaeology Ireland 4.2 (1990): 54-55.
In 1895 Wood-Martin wrote, ""The original purpose for which the large apertures were utilized seems to have been a literal as well as a symbolic means whereby an ailment, disease, or sin might be left behind, or got rid of, also as a symbol by which a compact could be ratified, or an oath taken, by a well-known and public act. The postulants, at first, probably crawled through the orifice; then when it, through change in custom, became diminished in size, they probably passed a hand, or, if a compact was to be made, clasped hands through it. The act of a bride passing her finger through her wedding ring may be but a survival of the ceremony when the woman would have had to crawl through an aperture in a sacred stone..." (Wood-Martin, W. G. Pagan Ireland an Arch├Žological Sketch; a Handbook of Irish Pre-Christian Antiquities. London: Longmans, Green, 1895. 308.)