Why Did God Destroy Sodom & Gomorrah, page-6

(Jude 7) In the same manner, Sodʹom and Go·morʹrah and the cities around them also gave themselves over to gross sexual immorality and pursued unnatural fleshly desires; they are placed before us as a warning example by undergoing the judicial punishment of everlasting fire.

There are many that refuse to learn!

(Jude 17, 18) As for you, beloved ones, call to mind the sayings that have been previously spoken by the apostles of our Lord Jesus Christ, 18 how they used to say to you: “In the last time there will be ridiculers, following their own desires for ungodly things.”

Jude wrote his inspired letter about 65 CE, just before Jerusalem fell to the Romans. We are now living in the ''last time'' of the corrupt world wide system of things. Apostate Christendom will soon be destroyed along with the rest of false religion that tolerates ''gross sexual immorality'' and engages in ''unnatural fleshly desires''.