Psychopaths are manipulative, charming, glib, deceptive, parasitic, irresponsible, selfish, callous, promiscuous, impulsive, antisocial, and aggressive individuals who have no concern for the welfare of others, experience little remorse or guilt as a result of their injurious and antisocial behavior, do not tolerate delay of gratification, and persevere despite punishment; psychopaths are mostly male and are less than 1% in the general population; approximately 11% of the forensic psychiatric population and 23% of the correctional population are psychopaths.