The Femicidal Mania Virus a highly contagious pathogen that only infects human males and causes them to attack and kill the women around them. An epidemic of this disease would lead to an epidemic of femicide - the mass and organized murders of women. The same linkage is seen in the males of many other species. In many if not all species it is the aggressive behavior which appears first, and then changes to copulatory behavior when the appropriate signal is presented.