Also it must be carefully noted that, although the Scripture speaks of Incubi and Succubi lusting after women, yet nowhere do we read that Incubi and Succubi fell into vices against nature. We do not speak only of sodomy, but of any other sin whereby the act is wrongfully performed outside the rightful channel. And the very great enormity of such as sin in this way is shown by the fact that all devils equally, of whatsoever order, abominate and think shame to commit such actions. And it seems that the gloss on Ezekiel xix means this, where it says: I will give thee into the hands of the dwellers in Palestine, that is devils, who shall blush at your iniquities, meaning vices against nature. And the student will see what should be authoritatively understood concerning devils. For no sin has God so often punished by the shameful death of multitudes.

Indeed many say, and it is truly believed, that no one can unimperilled persevere in the practice of such vices beyond the period of the mortal life of Christ, which lasted for thirty-three years, unless he should be saved by some special grace of the Redeemer. And this is proved by the fact that there have often been ensnared by this vice octogenarians and centenarians, who had up to that time ruled their lives according to the discipline of Christ; and, having once forsaken Him, they have found the very greatest difficulty in obtaining deliverance, and in abandoning themselves to such vices.

F. Henricus Institoris et F. Jacobus Sprengerus, Inquisitores, Malleus Maleficarum, Pars I., Quaestio IV. (1484; English tr. Rev. Montague Summers, 1928)