Jude (Judah) 1:7, 10

In a similar way, the cities of Sodom and Gomorrah and nearby towns gave themselves to sexual immorality and the unnatural desire of different flesh. Now they all serve as examples of those who experience the punishment of eternal fire.

These people insult anything they don’t understand. They behave like irrational beasts by doing whatever they feel like doing. Because they live by their animal instincts, they corrupt themselves and bring about their own destruction.