In verses 6 and 7, Jude identifies the sin of Sodom and Gomorrah as unnatural lust, and not just in-hospitality. Although the ancient world had no real equivalent to the modern conception of sexual preference, it cannot be said that the Bible has no preference regarding sexuality.
Throughout the passage here and later on in verse 14 there is a reference to the apocryphal book of Enoch (verse 14 goes as far as quoting the book) and the ”sons of God” in Genesis 6. It is unclear what Jude thinks of the book as a whole (the Church eventually rejected it from the canon), but he seems to think the verse he cited was a prophecy.
Jude then speaks against those false teachers who have ”reviled whatever they do not understand,” and who ”follow their own lusts” and flatter ”people to gain advantage.” These worldly people are devoid of the Holy Spirit.
It is notable that Jude refers to Moses and Enoch, both of whom were assumed into Heaven, and that both Sodom and Gomorrah and Korah’s rebellion are cases where the Earth opened up to swallow up something into Hell. Much of the language here is similar or identical to that in 2 Peter, suggesting that these authors are consulting a common source (an apostolic memo, perhaps).
The closing theme is Gerard Satamian’s Chansons Sans Paroles Op. 2 Pastorale, from the album Dry Fig Trees. www.magnatune.com