St. Thomas Aquinas.
St. Thomas speaks of Sinful homosexuality.
[Romans 1:26] Because of this, God handed them over to shameful passions. For example, their females have exchanged the natural use of the body for a use which is against nature. (1:27) And similarly, the males also, abandoning the natural use of females, have burned in their desires for one another: males doing with males what is disgraceful, and receiving within themselves the recompense that necessarily results from their error. (1:28) And since they did not prove to have God by knowledge, God handed them over to a morally depraved way of thinking, so that they might do those things which are not fitting.
St Thomas says, "The 'natural use of the body' to which Paul refers is that type of sexual act, between a man and a woman, that is inherently capable of procreation. The Natural sexual act is inherently ordered toward procreation."
"Just as the ordering of right reason proceeds from man, so the order of nature is from God Himself: wherefore in sins contrary to nature, whereby the …More
St. Augustine.
Saint Augustine is categorical in the combat against sodomy and similar vices.
The Great Bishop of Hippo writes: "Sins against nature, therefore, like the sin of Sodom, are abominable and deserve punishment whenever they are commited. If all nations commited them, all alike would be held guilty of the same charge in God's law, for oue Maker did not prescribe that we should use each other in this way. In fact, the relationship that we ought to have with God is itself violated when our nature, of which He is Author, is desecrated by perverted lust...."
(St. Augustine,Confessions, Book III, chap. 8)