Moreover, to beget a child is the act of a living body, but devils cannot bestow life upon the bodies they assume; because life formally proceeds only from the soul, and the act of generation is the act of the physical organs which have bodily life. Therefore bodies which are assumed in this way cannot either beget or bear.
Due to this inability to create or nurture life, the method of the creation of a cambion is necessarily protracted. A succubus (that is to say the female of this particular brand of demon) will have sexual relations with a human male and by doing so acquire a sample of his sperm. This she will then pass on to an incubus. The incubus will, in his turn, transfer the sperm to a human female and thus impregnate her. Why this should result in anything other than a perfectly normal child is not discussed.
Yet it may be said that these devils assume a body not in order that they may bestow life upon it, but that they may by the means of this body preserve human semen, and pass the semen on to another body.
The text goes on to discuss at great length the arguments for and against this process being possible, citing a number of biblical quotations and noted scholars in support of its arguments, and finally concludes that this is indeed the method used by such demons.