In the past, sexual perversion was described as the deviation from the cultural and moral sexual boundaries. Today, psychology has come to shift it to the term paraphilia, which denotes a sexual interest that is considered atypical and that may or may not be associated with distress or injury. Paraphilia includes sexual interests with no regard to distress or harm and includes such interests as fetishism or voyeurism.
The definitions in the DSM-5-TR, as an example, regard only those paraphilias that instigate personal torment or inflict harm as ‘paraphilic disorders’. This is a reflection of more subtle thinking because it does not conflate ‘pathological’ with ‘unusual sexual behaviors’.
Consensually engaging in activities that indeed are ‘unusual sexually’, but are benign, are not regarded as disorders. This etymological shift demonstrates the fact that psychology as a discipline has come to think of sexual variance in more positive, rather than moral, terms of health, consent, and well-being.