Paraphilia

n. (Psychiatry) psychosexual disorder characterized by unusual sexual desires that involve very dangerous activities, sexual perversion; sexual attraction that is not normal; mental disorder for obsessive unusual sexual practices

Paraphilia (in Greek para παρά = besides and -philia φιλία = love)—in  psychology and sexology, is a term that describes a family of persistent, intense fantasies, aberrant urges, or behaviors involving sexual arousal to nonhuman objects, pain or humiliation experienced by oneself or one's partner, children or other nonconsenting individuals or unsuitable partners. Paraphilias may interfere with the capacity for reciprocal affectionate sexual activity. Paraphilia is also used to imply non-mainstream sexual practices without necessarily implying dysfunction or deviance (see Clinical warnings section). Also, it may describe sexual feelings toward otherwise non-sexual objects.
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Paraphilia /para·phil·ia/ a psychosexual disorder marked by sexual urges, fantasies, and behavior involving objects, suffering or humiliation, or [more]Paraphilia - Community and Resources

Noun
1. abnormal sexual activity
(hypernym) perversion, sexual perversion
(hyponym) exhibitionism, immodesty

Paraphilias are a variety of complex psychiatric disorders which are manifest as deviant sexual behavior. For example, in men the most common forms are pedophilia (sexual behavior toward children) and exhibitionism (exposing one’s body in public setting). Men with paraphilia are usually treated with psychotherapy, antidepression medications, and medications that alter hormones, particularly testosterone (male sex hormone).