In the animal kingdom, promiscuity can function as a form of insurance.

Female chimpanzees mate frequently—up to 50 times a day—with multiple males in their group. One function of this promiscuity is to create uncertainty about paternity. If many males have mated with the same female, each one may treat a newborn as potentially his own, which reduces the likelihood of aggression or infanticide.

This does not require conscious intent. The female is not deliberately thinking, “I should mate widely to confuse paternity,” and the males are not reasoning, “I won’t harm this infant because it might be mine.” The behavior persists because of its effects, not because of any articulated strategy.

This is the key point from an evolutionary perspective: natural selection operates on outcomes. Behaviors that reduce the risk of harm to offspring—such as paternity confusion—are more likely to be passed on, regardless of whether the animals involved understand why they behave this way.

A similar logic appears across species. In chimpanzees, males are less likely to harm infants when paternity is uncertain. Variants of this pattern are also observed in bonobos and other animals. More broadly, many adaptive behaviors unfold without conscious awareness. A spider does not understand that it spins a web to catch insects and sustain itself. It simply follows instinctive patterns shaped over millions of years.

In the same way, chimpanzee mating behavior can function as an effective reproductive strategy without ever being consciously represented as one.