At a minimum, ALL sexual activity outside of the marriage between a man and a woman is sin. So all homosexual sex, even in not spelled out, is at least "fornication". It is not the unitive and reproductive union ordained by God. The deeply deceptive and disingenuous part of the homosexual/gay lobby is that homosexual sex acts should somehow be distinct from all other sexual immorality because there is possibly a natural inclination in some percentage of the population. This may fly in secular "politics". There is no such distinction to God. So even if every political body in the world were to sanction homosexual sex, (and in fact, most of them already have), it can not be made right spiritually. If every country on earth called the monogamous pairing of same sex couples "marriage", it still wouldn't be the union described by God. The other thing that gets overlooked is that all of this applies to HETERO sexual persons as well. There are far more heterosexual persons per capita messing around with debauchery and fornication than same sex attracted persons. If nothing else because of the sheer number of heterosexual persons vs. homosexual persons. NOBODY gets a pass. Sexual immorality is a sin no matter who practices it, or with whom they practice it. This is why the Saints, the Fathers, and such say that it is better to pair up in man/woman marriages, or to be celibate/continent. So we are not putting our very salvation at risk.
So Christ Himself mentions this in the Gospel according to Matthew:
Matt 15:19 It is from the heart that his wicked designs come, his sins of murder, adultery, fornication, theft, perjury and blasphemy. 20 It is these make a man unclean; he is not made unclean by eating without washing his hands.
St. Paul refers to fornication and debauchery as sin here:
1 Cor 6:18 Keep clear, then, of debauchery. Any other sin a man commits, leaves the body untouched, but the fornicator is committing a crime against his own body.[5] 19 Surely you know that your bodies are the shrines of the Holy Spirit, who dwells in you. And he is Gods gift to you, so that you are no longer your own masters. 20 A great price was paid to ransom you; glorify God by making your bodies the shrines of his presence.
Romans 13:12 The night is far on its course; day draws near. Let us abandon the ways of darkness, and put on the armour of light. 13 Let us pass our time honourably, as by the light of day, not in revelling and drunkenness, not in lust and wantonness, not in quarrels and rivalries. 14 Rather, arm yourselves with the Lord Jesus Christ; spend no more thought on nature and natures appetites.
1 Cor 5:1 Why, there are reports of incontinence among you, and such incontinence as is not practised even among the heathen; a man taking to himself his fathers wife. 2 And you, it seems, have been contumacious over it, instead of deploring it, and expelling the man who has been guilty of such a deed from your company.
1 Cor 6: 9 Yet you know well enough that wrong-doers will not inherit Gods kingdom. Make no mistake about it; it is not the debauched, the idolaters, the adulterous, 10 it is not the effeminate, the sinners against nature, the dishonest, the misers, the drunkards, the bitter of speech, the extortioners that will inherit the kingdom of God.
1 Cor 10:5 And for all that, God was ill pleased with most of them; see how they were laid low in the wilderness. 6 It is we that were foreshadowed in these events. We were not to set our hearts, as some of them set their hearts, on forbidden things. 7 You were not to turn idolatrous, as some of them did; so we read, The people sat down to eat and drink, and rose up to take their pleasure.[3] 8 We were not to commit fornication, as some of them committed fornication, when twenty-three thousand of them were killed in one day.[4] 9 We were not to try the patience of Christ, as some of them tried it, the men who were slain by the serpents;[5] 10 nor were you to complain, as some of them complained, till the destroying angel slew them.[6] 11 When all this happened to them, it was a symbol; the record of it was written as a warning to us, in whom history has reached its fulfilment; 12 and it means that he who thinks he stands firmly should beware of a fall.[7] 13 I pray that no temptation may come upon you that is beyond mans strength.[8] Not that God will play you false; he will not allow you to be tempted beyond your powers. With the temptation itself, he will ordain the issue of it, and enable you to hold your own.
Gal 5:18 It is by letting the spirit lead you that you free yourselves from the yoke of the law. 19 It is easy to see what effects proceed from corrupt nature; they are such things as adultery, impurity, incontinence, luxury, 20 idolatry, witchcraft, feuds, quarrels, jealousies, outbursts of anger, rivalries, dissensions, factions, 21 spite, murder, drunkenness, and debauchery. I warn you, as I have warned you before, that those who live in such a way will not inherit Gods kingdom.
Ephes 5: 3 As for debauchery, and impurity of every kind, and covetousness, there must be no whisper of it among you; it would ill become saints; 4 no indecent behaviour, no ribaldry or smartness in talk; that is not your business, your business is to give thanks to God. 5 This you must know well enough, that nobody can claim a share in Christs kingdom, Gods kingdom, if he is debauched, or impure, or has that love of money which makes a man an idolater.
Coll 3:5 You must deaden, then, those passions in you which belong to earth, fornication and impurity, lust and evil desire, and that love of money which is an idolatry. 6 These are what bring down Gods vengeance on the unbelievers,
1 Thes 4:3 What God asks of you is that you should sanctify yourselves, and keep clear of fornication. 4 Each of you must learn to control his own body, as something holy and held in honour,[1] 5 not yielding to the promptings of passion, as the heathen do in their ignorance of God. 6 None of you is to be exorbitant, and take advantage of his brother, in his business dealings. For all such wrong-doing God exacts punishment; we have told you so already, in solemn warning.
Hebr 13:4 Marriage, in every way, must be held in honour, and the marriage-bed kept free from stain; over fornication and adultery, God will call us to account.
Christ again, in His revelation to St. John:
Rev 21:7 Who wins the victory? He shall have his share in this; I will be his God, and he shall be my son. 8 But not the cowards, not those who refuse belief, not those whose lives are abominable; not the murderers, the fornicators, the sorcerers, the idolaters, not those who are false in any of their dealings. Their lot awaits them in the lake that burns with fire and brimstone, and it is the second death.
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Various forms of "fornication"
Enhanced Strong's Lexicon:
translates as "fornication" 26 times. 1 illicit sexual intercourse. 1a adultery, fornication, homosexuality, lesbianism, intercourse with animals etc. 1b sexual intercourse with close relatives; Lev. 18. 1c sexual intercourse with a divorced man or woman; Mk. 10:11,12. 2 metaph. the worship of idols. 2a of the defilement of idolatry, as incurred by eating the sacrifices offered to idols.
I hope this all helps somewhat. That's honestly my intent.
May God bless
