Sex is a situation where the man has the power, which they grant the woman. The power, the physical ability to say no, comes from the man. He grants this power to the woman. While this may not be always literally true, it is psychologically and spiritually true of the sexual relationship between man and woman.
...we will have to agree that rape (as you yourself agreed that it is) is natural. However, this is known to not be the case. Otherwise, instead of the elaborate mating rituals that many different species engage in, the male of the species would simply take the female anytime and any place of his choosing. So, can you explain this disrecepancy?
Define "natural". There are plenties of species that practice rape.
Like lions?
No, rape is not natural.
Look at any couple. In almost every instance, women seek out men who are larger and stronger than they are, as well as more aggressive and more assertive.
One stereotypical dysfunctional marriage is the assertive wife and submissive husband. He is miserable, she doesn't respect him.
The fact that the average man is physically more powerful than the average woman provokes debate is an astounding commentary to the dishonesty and prevalance of feminist thought.
Like I said, if you can't dispense with feminism, nothing I said will make sense.
First of all man is not like other animals and behavioral comparisons don't hold up. A female animal comes into heat only infrequently while a woman is capable of sexual activity almost constantly (under the right conditions).
Rape, however, is natural in the human. That's why every religion preaches against it and every code of law mentions it. If it was unnatural (and thus rare) it wouldn't get any attention at all.
(note that murder, theft, other sexual perversions etc are all human nature. We are failed creations always seeking to serve ourselves first and to hell with the rest of the world. Only training and social pressure keeps our baser inclinations in check)
The truth is that man has the power over woman. This is both a physical truth (on average a man will always be stronger than a woman) and a biblical truth. The thing that separates us from the animals (and the liberals) is that we choose to restrain ourselves in order to live in a peaceful society. While rape has a high level of success in passing on one's genes (and satisfying one's sexual urges) it has a low level of success for continued peaceful relations and a long life.
Men are self-centered but we're also smart. By letting the woman have the power we assure ourselves (on average) of more sexual activity that we don't have to fight for.