| References
Medieval theologian
Thomas Aquinas said of Lust:
...wherever
there occurs a special kind of deformity whereby the venereal
act is rendered unbecoming, there is a determinate species of
lust. This may occur in two ways: First, through being contrary
to right reason, and this is common to all lustful vices; secondly,
because, in addition, it is contrary to the natural order of the
venereal act as becoming to the human race: and this is called
"the unnatural vice." This may happen in several ways. First,
by procuring pollution, without any copulation, for the sake of
venereal pleasure: this pertains to the sin of "uncleanness" which
some call "effeminacy." Secondly, by copulation with a thing of
undue species, and this is called "bestiality." Thirdly, by copulation
with an undue sex, male with male, or female with female, as the
Apostle states (Rm. 1:27): and this is called the "vice of sodomy."
Fourthly, by not observing the natural manner of copulation, either
as to undue means, or as to other monstrous and bestial manners
of copulation.
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