Just some rough ideas.
From the nature’s perspective, the mission of the creatures in this world is to spread genes. Whoever performs the task better, which means do the job faster and more efficient, will always gets the reward, SURVIVE. But I think the natural probably doesn’t care about the life quality of any simple individual.
For example, the men who live on earth now proves that their ancestors are more successful in spreading genes. They must had more sex partners and may possess the intuition to commit rape. It’s simply because doing so can increase the chance to have more offspring. But here comes the problem. If you get many sex partners, it’s very difficult to deal with the relationships. Hence you may live in a life full of quarrels, even fights, everyday. For most people, it’s like a torture both physically and mentally. And if you commit rape, it maybe good for your flesh and blood, since they get the chance to be born. But it’s definitely bad for you. I know there are so many rapes that have not been reported, still if you committed it, you are more likely to be pursued by the law and get punished, even death penalty can be applied depends on what period of history you lived. So why bother? I think the answer is we’re all slave of the nature and nature makes us the slave of our intuition. Whoever can be more adapted to the world, no matter what manner he takes. Whoever against this rule simply gets vanished from the earth. That’s the reality, such a cruel nature.