Fertility was the major theme of pagan religions, and fertility symbols were not excluded from cathedral walls. If these symbols were on the outside walls, they might scare off evil spirits. This would explain how some fairly crude sexual imagery came to be preserved on the outer walls. However, some would argue that these images may arouse more than they discourage. The most crudely sexual image is perhaps that of Sheelagh-na-Gig, commongly found on medieal Irish churches. Her eyes are typically round and deeply drilled, with no mouth and an obscene pose:
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Gargoyles