The female must have a strong maternal drive and stay close to the male if she is to get his genes and fulfil her maternal drive. By staying close to the male she will remain safer from predators, as he is physically stronger. He will remain with her to obtain sexual gratification. The female chimpanzee has an amazingly powerful maternal drive; otherwise the young would not survive. She will protect her young to the death if need be. She also has a strong nesting instinct to provide shelter for the young.
