Perversion

[per-vur-zhuh n, -shuh n] /pərˈvɜr ʒən, -ʃən/

noun
1.
the act of .
2.
the state of being .
3.
a form of something.
4.
any of various means of obtaining sexual gratification that are generally regarded as being abnormal.
5.
Pathology. a change to what is unnatural or abnormal:
a perversion of function or structure.
/pəˈvɜːʃən/
noun
1.
any abnormal means of obtaining sexual satisfaction
2.
the act of perverting or the state of being perverted
3.
a perverted form or usage
n.

late 14c., “action of turning aside from truth, corruption, distortion” (originally of religious beliefs), from Latin perversionem (nominative perversio) “a turning about,” noun of action from past participle stem of pervertere (see pervert (v.)). Psychological sense of “disorder of sexual behavior in which satisfaction is sought through channels other than those of normal heterosexual intercourse” is from 1892, originally including homosexuality.

Perversions are defined as unnatural acts, acts contrary to nature, bestial, abominable, and detestable. Such laws are interpretable only in accordance with the ancient tradition of the English common law which … is committed to the doctrine that no sexual activity is justifiable unless its objective is procreation. [A.C. Kinsey, et.al., “Sexual Behavior in the Human Male,” 1948]

perversion per·ver·sion (pər-vûr’zhən, -shən)
n.
A practice or act, especially one that is sexual in nature, considered abnormal or deviant.