An imprecise term used to designate sexual variance.
Sexual deviation.
A form of behaviour which is thought to be unnatural, dangerous or disgusting.
Action considered unnatural or abnormal, especially a sexual activity deviating from what is considered normal.
Any abnormal sexual behavior. (An equivalent term with less derogatory implications is deviation.) The abnormality may be in the sexual object (as in homosexuality and fetishism) or in the activity engaged in (for example, sadism and exhibitionism). The activity is sexually pleasurable.
Deviation from the normal path, whether it be in the area of one’s intellect, emotions, actions, or reactions.