That being said, I'd like to make it plain where I stand on the issue of human sexuality.
I flatter myself with the title of Christian. As such, I am by religious belief and right reason morally opposed to any form of human sexual activity outside of monogamous, non-contracepted man-woman marriage. That much is non-negotiable. I believe that it is wrong to practice homosexuality, to attempt to mimic the physical attributes of another sex, or to divorce and remarry. I think adultery, fornication, and contraception are mortally sinful. These are my religious beliefs, and I don't care if people find them to be offensive or not.
Like most people, however, I have relatives, good friends, and other loved ones who practice homosexuality; others who are victim to transvestitism, or to other sexual perversions. As a Catholic, I find such practices to be both revolting and immoral, and my homosexual (etc.) loved ones know this. I do not hide my beliefs from them: they know where I stand, and they disagree — but they also respect my beliefs while in my house. Not one of them has ever behaved with the least scintilla of licentiousness while under my roof. Many of these folks are conservative politically, and a few are Christians who know perfectly well what the Church teaches about sodomy. All are polite, well-mannered, and sensitive to our beliefs. Under my roof we do not dispute about their sexual behavior; rather than engaging in pointless bickering, we simply do not discuss the issue. Such argument is futile. There are crucifixes all over my house; I let the One crucified do the arguing. If His death and resurrection are not enough to win the argument, notning I can say will help.
It is required of us as Christians to hate sin and to fight against it; however, to hate those that commit sin is to sin ourselves. Yes, sodomy is a filthy perversion — but which of us can honestly claim the right to cast the first stone in that regard? Every person on earth has a perversion of some sort, lurking like a monster within the depths of his heart. we know these monsters as the Seven Deadly Sins. Our job as Christians is to fight these monsters with God's help, not to point out the monster that our neighbor is battling — for he knows his own heart well enough. The law of God is no mystery; the knowledge of Right and Wrong is written on the heart of every man. The homosexual, like the drunkard, the fornincator, or the adulterer, knows deep down that his acts are wrong, and does not need you or me to point it out to him. To do so is, in my opinion, to be a hypocrite.
Should we boldly proclaim our Christian beliefs? Certainly! But once we have made our beliefs clear, either through words or by deeds, our duty in that regard is done. My loved ones who are homosexual, shacked-up, or remarried know that if they were to ask me what I thought of their lifestyle, I'd tell then flat out, "I love you, but God says that what you are doing is horribly immoral." Therefore, they do not ask my opinion, and I do not offer it.
Should we oppose sodomy? Yes! But that's not the same thing as opposing sodomites, and I think it's time we took a step back and put our battle against sexual immorality in perspective. Being in a disordered relationship with sexual desire is a sin — but it's no worse than any other sin. We wink at the adulterer, the fornicator, and the pornography addict, even though adultery, fornication, and pornography are responsible for untold misery. We single out sodomites and cross-dressers for our special condemnation, but drug abusers, gluttons, and the irresponsibly slothful cause our society untold harm. How is such discrimination just or righteous?
Disorder is disorder. A man in the grip of a disordered relationship with sexual desire ought to receive the same love and respect we grant the man who suffers from a disordered ralationship with booze. If a drunkard moves in next door no one cares; so long as he keeps his drunkness behind closed doors and keeps his lawn neatly trimmed, we figure it's his business and we treat him like a neighbor. If we can treat a man in the grip of alcoholism with basic courtesy, we ought to be able to do the same to our neighbors who — for whatever reason — suffers from disordered sexual desire.
As Christians, we must continue to fight against sin. We must loudly and boldly proclaim the teaching of our Lord with regard to human sexuality. For the record, that teaching is:
Homosexuality refers to relations between men or between women who experience an exclusive or predominant sexual attraction toward persons of the same sex. It has taken a great variety of forms through the centuries and in different cultures. Its psychological genesis remains largely unexplained. Basing itself on Sacred Scripture, which presents homosexual acts as acts of grave depravity, tradition has always declared that "homosexual acts are intrinsically disordered." They are contrary to the natural law. They close the sexual act to the gift of life. They do not proceed from a genuine affective and sexual complementarity. Under no circumstances can they be approved.With this in mind, we must oppose any political activity that tends to normalize immorality or grant the protection of the state to immoral sexual behavior. We must do our utmost to protect and defend the natural human family from those who would destroy it. But we must never fall into Satan's trap of condemning those who willingly commit sexual sin. We are all willing sinners; to damn others for their sins is to condemn ourselves. Instead, we should love our fellow sinners, pray for them, and help them to overcome their sins, just as we ask for their help in overcoming our own.The number of men and women who have deep-seated homosexual tendencies is not negligible. This inclination, which is objectively disordered, constitutes for most of them a trial. They must be accepted with respect, compassion, and sensitivity. Every sign of unjust discrimination in their regard should be avoided. These persons are called to fulfill God's will in their lives and, if they are Christians, to unite to the sacrifice of the Lord's Cross the difficulties they may encounter from their condition.
Homosexual persons are called to chastity. By the virtues of self-mastery that teach them inner freedom, at times by the support of disinterested friendship, by prayer and sacramental grace, they can and should gradually and resolutely approach Christian perfection.
{Catechism of the Catholic Church, 2357-2359]
(Note: I am neither a theologian nor a saint; it is probable that my arguments above are in some way flawed. If I have in fact made some error in my reasoning here, I humbly ask my more learned Christian brothers and sisters to correct me.)