Just a note, I was reading Lactantius today and in pointing the many deviations of the Greek gods he calls the attention to the sin of the homossexual act. He defined it as "the wors form of adultery, for it is adultery against nature itself."
What was the conduct of Jupiter, the father of all these, who in the customary prayer is styled "Most Excellent and Great"? Is he not, from his earliest childhood, proved to be impious, and almost a parricide, since he expelled his father from his kingdom, and banished him, and did not await his death though he was aged and worn out, such was his eagerness for rule? And when he had taken his father’s throne by violence and arms, he was attacked with war by the Titans, which was the beginning of evils to the human race; and when these had been overcome and lasting peace procured, he spent the rest of his life in debaucheries and adulteries. I forbear to mention the virgins whom he dishonoured. For that is wont to be judged endurable. I cannot pass by the cases of Amphitryon and Tyndarus, whose houses he filled to overflowing with disgrace and infamy. But he reached the height of impiety and guilt in carrying off the royal boy. For it did not appear enough to cover himself with infamy in offering violence to women, unless he also outraged his own sex. This is true adultery, which is done against nature.http://www.ccel.org/ccel/schaff/anf07.iii.ii.i.xi.html
This is interesting in that the Bible and the Fathers don't seem to put the homosexual act as a sin like all others. They clearly seem to say that a steady loving relationship between a homosexual pair is far worse than an adulterous and promiscuous man or woman. Lactantius gives us a reason there: while the "usual" fornicator betrays people, betrays trust, the practicing homosexual (and by implication practicioners of other paraphilias) by treating men as women, or women as men in their hearts, and in cultivating this, are dettached from reality, they are "betraying nature itself".
One can compare the fornicator to a glutton. He is slave to the excess of a certain impulse. A homosexual act, on the other hand, is like a person who eats fabric, or dust or metals. He longs and delights with things that are not really what he/she feels they are. They suffer of what Paul Sérieux called "dellusion of interpretation" which can also happen concerning love and desire. Basically the person does not hallucinate as such, because hallucionations are sensorial: people see and hear things. One who suffers of "dellusions of interpretation", can be said to "hallucinate" only in the perception of sensorial information that is real. For example, a person sees a train coming in her direction and instead of feeling fear or the impulse to jump, the person feels happy. The person is a wife that is beaten every day by a drunk husband and is convinced that he does it because he loves her. The person sees and perceives the facts as they are. But they *feel* and perceive them in an absolutely dellusional way.
That's the case with all the paraphilias, including homosexuality. The man sees another man, knows it's a man, knows that he is a man, but he feels about the other person as the other person was a woman. Or he feels about himself as he was a woman. The feeling exists, but it is not true, in the sense that it does not correspond to reality.