Chapter — Bucceroni, Commentaries (1910)

Chapter II: On the Consummated Sins of Lust According to Nature

42.
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  1. Some sins of consummated lust are according to nature, namely when they are exercised in that mode which is not opposed to the generation of the human species; that is, if in intercourse diverse sex, the same species, and the natural vessel and mode are preserved. Others are against nature, if semen is poured forth in a mode not apt for generation; that is, if the things just enumerated are not preserved, whether this happens in intercourse or outside intercourse. We shall speak of the former in the present chapter, and of the latter in the following one. - L. 412, 432; St. Thomas, 2.2, q. 154, a. 2.

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