This chapter begins by considering some general points from theoretical analyses of power which are relevant to both explanations. Violence between males has also been viewed within a power framework, albeit one which involves a more limited view of power, one derived from the concept of dominance hierarchies in animals. Structural power - that which resides in the state and organizations - is an important basis for feminist explanations of male violence towards women. The chapter considers two very different types of power explanations for male violence: the structural explanation of violence towards women, and the interpersonal status explanation of inter-male violence. The concept of dominance was introduced to describe the behaviour of animals, and later transferred to observational and peer-rating studies of children, principally boys. When considering the evolutionary origins of men's structural power over women, we need also to consider the conflicting reproductive interests of males and females.