When a person indulges themself in carnal activities such as sex, there is a tendency to want to experience the sensation more and more often,
As the indulgence occurs more often there is a lessening of the high achieved in the act. So, experimentation begins.
When one form of experimentation is repeated enough the high does not seem as high. So, a different experiment is tried, and tried, and tried, until boredom again sets in with the cycle of experimentation repeated.
As experimentation goes on, the original purpose of sex is left behind. What was that purpose? To procreate and to experience intimacy with one's spouse.
Sex becomes a self-gratifying indulgence which is perversion, regardless of how it is enacted.
The more the self-gratification, the further a person goes into depravity, shame and condemnation.
The only way to deal with the consequences of depravity is to turn one's back on the law giver - the One who defined normal.