My issue with that is this:
The verses are:
5 Now I want to remind you, although you once fully knew it, that Jesus, who saved[c] a people out of the land of Egypt, afterward destroyed those who did not believe. 6 And the angels who did not stay within their own position of authority, but left their proper dwelling, he has kept in eternal chains under gloomy darkness until the judgment of the great day— 7 just as Sodom and Gomorrah and the surrounding cities, which likewise indulged in sexual immorality and pursued unnatural desire,[d] serve as an example by undergoing a punishment of eternal fire.
8 Yet in like manner these people also, relying on their dreams, defile the flesh, reject authority, and blaspheme the glorious ones.
I know these passages have some issues and that there isn't unanimous view on what they mean, but a possible view is:
Angels did not stay in their proper place ( both in location AND position of hierarchy).
They sinned like Sodom and Gomorrah which indulged in sexual immortality and pursued unnatural desire and in like manner, defile flesh, reject authority and blaspheme the "glorious ones" ( other angels?)
I know some scholars like to put a "pause" or a "separation" between verses 6 and 7 BUT the grammer doesn't call for that.
It seems that Jude is associating what happened in Sodom and Gomorrah with the sin of the angels that abandoned their station.
Jude is associating the sin of the angels with the sin of Sodom and Gomorrah, but he is also associating the sin of the angels with:
verse 4 - those who turn the grace of our God into licentiousness and deny our only Master and Lord, Jesus Christ.
verse 5 - Israelites who did not believe after the Lord delivered them out of Egypt
- those who have gone the way of Cain
- those who rushed headlong into the error of Baalam
- those who perished in the rebellion of Korah
There are a number of sins that Jude provides examples of in Jude, and there is nothing in Jude 1 that says that the sin of the angels in Jude 1:6 had anything to do with sexual relations.
All Jude says about the specific sin of the angels is that they left their proper abode... that's it... nothing more, nothing less.
The common thread that ties together all these examples of sins that Jude lists is that they result in condemnation and punishment.
Jude is saying that
These folks in verse 4 who deny Jesus Christ are going to face condemnation:
- those Israelites who did not believe after being saved from Egypt were punished
- those angels who left their proper abode were punished
- those in Sodom and Gomorrah who indulged in gross immorality were punished
- Cain was punished
- and those who followed the error of Baalam were punished
- and those who participated in the rebellion of Koran were punished.
The short version is...
Those who rebel against God and engage in a life of sin will be condemned/punished.