Any type of sexual practice which society regards as abnormal. Deviation may be related to the activity, such as EXHIBITIONISM or sadomasochistic sex (see SADISM; MASOCHISM); or to a perceived sexual object, for example shoes or clothes (fetishism). Different cultures have different values, but the attitude to these matters should depend on whether the deviation is antisocial or harmful to the participant(s). For example, paedophilia is generally seen as harmful so requiring sanctions such as imprisonment, whereas many see simple fetishism as harmless.