Current statistics on arrests, convictions, and prison inmates, as well as recent studies on violence by women show that the number of women who commit violent crimes is increasing. The violence by women is associated with murder, rape, terrorism, gang participation, domestic violence, and prostitution. Murders by women are often committed against partners who have physically abused them. Women have also been aggressors in sexual assaults against both men and other women. Recent studies show that female terrorists manifest extreme viciousness and cruelty. Women have also been involved in gang activities that include muggings and theft. Women's physical abuse of children and partners has apparently surpassed the incidence of domestic violence by men. Violence that stems from prostitution involves the prostitutes' need to support their chemical dependency. Studies show that the increase in violence is not restricted to adult women, and the number of female juvenile offenders is also increasing. Researchers have identified four factors that contribute to violence by women: premenstrual syndrome, the women's liberation movement, economic pressures, and substance abuse. Six recommendations for curbing violent behavior are offered.