The Catechism of the Summa - LI. OF CHASTITY AND OF VIRGINITY; AND OF THE SIN OPPOSED THERETO, VIZ., OF VOLUPTUOUSNESS (B)

(B)
What is the sin opposed to the virtue of chastity?

It is the sin called voluptuousness (CLIII.).

In what does the sin of voluptuousness consist?

It consists in using things on account of the pleasure attached thereunto which nature has ordained for the conservation of the human species, whether this be by deed, or desire, or thought willed, in which pleasure is taken; for this is contrary to the natural order whose office it is to control the use of such things (CLIV.).

Are there several species of voluptuousness?

Yes, there are as many species as there are distinct subversions of order in the things concerned with voluptuousness (CLIII. 1-3).

What are these distinct subversions of order in the matter of voluptuousness?

They are simple fornication, which is directly opposed to the good order of the things of marriage as regards the end of marriage, which is the welfare and the education of offspring; or, and this is the most grave of all, the sin against nature which is opposed directly and wholly to the first and essential end of marriage, which is the birth of offspring; or incest, adultery, the ravishing of a ward, and rape, which relate to the sexual abuse of those near to us by blood ties, or of those married, or of those in the guardianship of their protector, or of those against whom violence is performed; and lastly, sacrilege, which is the abuse of persons consecrated to God (CLIV. 1-12).

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