Okay, I'm going to weigh in on this. I don't know about whether Paul talked about homosexuality, maybe he did, but this is definitely NOT what is being discussed in the Epistle of Jude and 2 Peter (the latter reference being derived from the former). Let me first quote what it says in Jude 6-8:
Jude 6-8
"Next let me remind you of the angels who had supreme authority but did not keep it and left their appointed sphere; he has kept them down in the dark, in spiritual chains, to be judged on the great day. The fornication of Sodom and Gomorrah and other nearby towns is equally unnatural, and it is a warning to us that they are paying for their crimes in eternal fire. Nevertheless, these people are doing the same: in their delusions they not only defile their bodies and disregard authority, but abuse the glorious angels as well."
From the text itself, it is clear that the sin described is not homosexuality but sexual intercourse with divine angels. The key to understanding this are the words "equally unnatural" in Jude 7: what did the situation of Sodom and Gomorrah have in common with the situation of the incarnation of angels before the Flood that was "equally unnatural"? It was having sex with angels. Note also how v. 8 applies both situations to heretics who figuratively "defile their bodies" and "abuse the glorious angels", both descriptions of the same thing. The parallel text in 2 Peter 2:6-11 is derivative of the Jude text and its secondary features arise from the author's use of the more original Jude text.
There is much extrabiblical evidence of this too. You see, Jude is heavily steeped in the pseudepigraphal literature of the time, especially the Enochian literature which tell the story of the fallen angels who had intercourse with human women. Jude 14 is a verbatim quotation from 1 Enoch 1:9. Jude 14 also matches 1 Enoch 60:8 which refers to Enoch as "the seventh as Adam". Compare Jude 6 with 1 Enoch 10:4-6 ("Bind Azazel hand and foot and throw him into the darkness....He covered his face in order that he may not see light; and in order that he may be sent into the fire on the great day of judgment") and 10:11-12: "Bind Semjaza and the others who are with him, who fornicated with the women, that they will die together with them in all their defilement...Bind them for seventy generations underneath the rocks of the ground until the day of their judgment and of their consummation, until the eternal judgment is concluded." What is more, the connection between the sin of the fallen angels and the sin of Sodom and Gomorrah also derives from the Enochian literature. The Testaments of the Twelve Patriarchs quote and refer to a lost Enoch book that is related to 2 Enoch (cf. 2 Enoch 34:2 which relates sodomy to the sin of the angels), and this book clearly relates the two situations:
Testament of Naphtali 3:4-4:1
"Do not become like Sodom, which departed from the order of nature. Likewise the Watchers departed from nature's order; the Lord pronounced a curse on them at the Flood. On their account he ordered that the earth be without dweller or produce. I say these things, my children, because I have read in the writing of holy Enoch that you will also stray from the Lord."
In another reference to the fallen angels, the Testament of Reuben 5:5 says: "Flee from fornication....For it was thus they [women] had charmed the Watchers, who were before the Flood." The Testament of Benjamin 9:1 also states: "Now I suppose, from the words of the righteous Enoch, that there will be also evil-doings among you: for ye will commit fornication with the fornication of Sodom, and shall perish all save a few, and will multiply inordinate lusts with women." Here the sin of Sodom is again discussed by a work concerned with the sin of the angels, and its likening with "lusts with women" does not suggest homosexuality but rather fornication. Similarly Testment of Asher 7:1 says that Sodom "did not recognize the Lord's angels and perished forever," the sin thus being related to a failure to respect the divine angelic order in their fornication and not homosexuality. Jude, indebted as he was by the Enochian literature, is probably making a similar point.
Leolaia