Paraphilia (in Greek para παρά = besides and -philia φιλία = friendship)—in psychology and sexology, is a term that describes a family of persistent, intense fantasies, urges, or behaviors involving sexual arousal to nonhuman objects, pain or humiliation experienced by oneself or one's partner, or children or other nonconsenting individuals. 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. Also, it may describe sexual feelings toward otherwise non-sexual objects.

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http://en.wikipedia.org/wiki/Paraphilias