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In other cases it is the vis a tergo of goading circumstance that impels the woman to break out of the groove.
Hence his threefold distribution of sodomy; (1) Peripheric or anatomical, caused by an unusual distribution of the nerves and their hyperæsthesia; (2) Luxurious, when love a tergo is preferred on account of the narrowness of the passage; and (3) the Psychical.
The vis a tergo was their only resort; and secondly, if properly applied, the methods are unexcelled and correct, both upon mechanical and physiological principles.