When a young lion takes over a pride, and ousts the old lion, the new one will kill all the cubs fathered by the old lion. They do that because, as long as the female lions have cubs, they are not interested in sex. As soon as the cubs are all dead, within a few days, the females come into estris, and the new male gets what he came for. But, of course, they are just animals. HHmmm, animals, I think I see some similarities here.