r,
the other kinds of sacrilege pertaining to lustful matter are reduced
to other species of lust.

Reply Obj. 4: The sin of a husband with his wife is not connected
with undue matter, but with other circumstances, which do not
constitute the species of a moral act, as stated above (I-II, Q. 18,
A. 2).

Reply Obj. 5: As a gloss says on this passage, "uncleanness" stands
for lust against nature, while "lasciviousness" is a man's abuse of
boys, wherefore it would appear to pertain to seduction. We may also
reply that "lasciviousness" relates to certain acts circumstantial to
the venereal act, for instance kisses, touches, and so forth.

Reply Obj. 6: According to a gloss on this passage "lust" there
signifies any kind of excess.
_______________________

SECOND ARTICLE [II-II, Q. 154, Art. 2]

Whether Simple Fornication Is a Mortal Sin?

Objection 1: It would seem that simple fornication is not a mortal
sin. For things that come under the same head would seem to be on a
par with one another. Now fornication comes under the same head as
things that are not mortal sins: for it is written (Acts 15:29):
"That you abstain from things sacrificed to idols, and from blood,
and from things strangled, and from fornication." But there is not
mortal sin in these observances, according to 1 Tim. 4:4, "Nothing is
rejected that is received with thanksgiving." Therefore fornication
is not a mortal sin.

Obj. 2: Further, no mortal sin is the matter of a Divine precept. But
the Lord commanded (Osee 1:2): "Go take thee a wife of fornications,
and have of her children of fornications." Therefore fornication is
not a mortal sin.

Obj. 3: Further, no mortal sin is mentioned in Holy Writ without
disapprobation. Yet simple fornication is mentioned without
disapprobation by Holy Writ in connection with the patriarchs. Thus
we read (Gen. 16:4) that Abraham went in to his handmaid Agar; and
further on (Gen. 30:5, 9) that Jacob went in to Bala and Zelpha the
handmaids of his wives; and again (Gen. 38:18) that Juda was with
Thamar whom he thought to be a harlot. Therefore simple fornication
is not a mortal sin.

Obj. 4: Further, every mortal sin is contrary to charity. But simple
fornication is not contrary to charity, neither as regards the love
of God, since it is not a sin directly against God, nor as regards
the love of our neighbor, since thereby no one is injured. Therefore
simple fornication is not a mortal sin.

Obj. 5: Further