A “selfish gene” explanation need only propose a way in which a behavior might spread genes. For example, women who think that God wants them to be celibate may really be helping their brothers and sisters raise more children, thus spreading their own shared genes (according to the key neo-Darwinian theory of inclusive fitness).

 A “selfish gene” explanation need only propose a way in which a behavior might spread genes. For example, women who think that God wants them to be celibate may really be helping their brothers and sisters raise more children, thus spreading their own shared genes (according to the key neo-Darwinian theory of inclusive fitness).