Legalization of marital rape sends an important message, which is that frigidity is not a behavior that a husband need tolerate from his wife. The point is not that he should actually rape her, but that he has a right to if he wants to, since she is his property, given (or sold) to him by her father. This can help instill a proper attitude of submission, which will ultimately benefit her, since women like to be dominated. Not only that, but women will probably have an easier time getting men to want to marry them if they say, "Look honey, once we get married, you won't have to worry that I'll deny you sex, because you can just rape me whenever you want, and the law will allow it."
Men want to own women. But this isn't bad for women, because good men tend to feel a strong sense of moral obligation toward their wives. A typical man, especially after he has had kids with his wife, will not want to divorce her, even if she is refusing sex after she promised she wouldn't do that.
So the typical feminist argument, "If she's not having sex with you, you can just divorce her," falls flat. Feminists who say that are putting themselves in men's shoes and thinking of what they would do if their needs weren't being met in a marriage, but men's sense of love and loyalty is typically less opportunistic than women's and their integrity is more to principles than to feelings. He will generally feel duty-bound to stay, even if he has other options. These days, men are realizing that marriage imposes obligations on them without offering them much in the way of benefits, so they are opting not to marry, with the result being that now there are bastard children running around everywhere.
One hypothesis (mentioned in A Natural History of Rape) for why rape evolved as a method of mating is that it helps ensure that women only reproduce with the strongest men, i.e. those who are capable of raping them. Therefore, women have been biologically programmed to sometimes often token resistance to sex (much like a shit test) as a way of seeing whether the man is strong enough to persist. If the man fails or is deterred by her cries of "No," "Stop," etc., this of course leads to her feeling frustrated at the man's weakness, and she then craves a real man who will dominate her the way she wants and expects. Rape is flattering to women, because it tells them that there is a man who wants her badly enough to force himself upon her if need be.
To quote Illimitable Men Maxim #122, "Women loathe being sexual objectified by lesser men, crafting their disgust for the unworthy into a veneer of moral superiority. Yet hidden within this guise of upright disgust is a depraved desire to be objectified by powerful men. Weak men get nothing, powerful men get perversions." Or as Sanchit Garg writes:
Even if we criminalize rapes, unlike normal criminal cases, marital rapes will be the most difficult cases to prove the alleged charges. It will be the word of the wife against the word of the husband. Naturally, there will be no eye witnesses or even medical proof of the same. The factum of sex between the two can never be denied, the semen samples or the pubic hair or the factum of any other medico-legal evidence can be naturally inferred to. Even, if the wife pleads injury to her private parts, the defence can attribute it to a wild intimate night.
In my opinion, the prosecution of marital rapes will be the most difficult of cases to prove and most of them will end in an acquittal. The prospects of Marital Rapes being used as a sword by disgruntled wives are also quite likely happen.
Rape legalization could even lead to better sex, as being raped provokes an emotional response in women, causing chemicals to flow that produce arousal and, ultimately, orgasm (which could explain the popularity of rape fantasy fiction such as Fifty Shades of Grey). It has been noted, "First of all, orgasms in women being raped are not frequent, but they are not uncommon either. In the study you cite, about 5% to 21% of women interviewed in the studies surveyed reported having an orgasm when they were raped. Researchers have hypothesized that the actual figure is probably a bit higher in reality due to victims being understandably embarrassed both by the rape and by having achieved an orgasm during unwanted, forced sexual relations. Around 20% seems to be a likely, real-word figure."
This is unsurprising, since it has often been noted that the use of male strength in the bedroom can give women vaginal tingles. Tingles generally tend to be caused when a man behaves in a way that shows masculinity and causes a woman to feel a range of emotions. A woman's experience of being raped by her husband might meet that description. It's certainly unlikely to be boring.
As we all know, a young woman will often prefer to open her legs to an exciting badboy rather than a boring niceguy. Women will even watch horror films because they love to feel the roller coaster of emotions of fear, relief, surprise, etc. Novels like The Fountainhead feature heroines who deliberately put themselves in situations that invite rape, and then at the moment when it's about to happen, they hope desperately that the man won't weaken and ask permission. Tuthmosis Sonofra notes, with regard to his pickups, "I'm shocked at how consistently girls will comment on the 'danger' of going home 'with a stranger.' It's like they're reading from a script. I had, literally, three girls over the course of the past 10 days say the same, identical shit. Of course, girls love 'dangerous situations' so play on that."