Women cannot control when they are fertile. Women cannot choose when ovulation begins or ends. Women cannot control the movement of their egg. During sex, women cannot remove their egg from their body and place it in someone else’s body. If sperm are nearby and the egg is fertile, the egg will activate and interact with the sperm, helping them penetrate the egg surface, but until then, the egg stays where it is and waits. It does not leave the body in search of a substance that can impregnate it.