It also accounts for the male desire to mate with as many females as possible. As a result the male is very concerned with paternity confidence. In humans, however, sexual dimorphism for males is very low and paternal investment is very high. As a result jealousy is one of his main weapons in terms of ensuring paternity confidence. This results in many things.
Men become very upset, even violent, at an instance of sexual indiscretion by a mate.
Women, on the other hand, have bodies that run on a proportionately small amount of food in comparison to males. They use this energy efficiency for gestation and lactation. Their relatively high paternal investment is to pass their genes on. In the human species, because of low male sexual dimorphism they require a higher level of investment from men. Women raise their children and expect and require resources from their mates.