Rape is either about:
- Power
- Sexual pleasure
- Combination
If rape is about power, then how could that be the case?
Analogy mode:
You know who has more power than someone with $2 billion? Somebody with $2 billion that lives in a country where it's illegal to be a billionaire, but they get away with it due to government inaction. If you legalize all billionaires, then the actual billionaire loses a lot of power over the, "victims" (the people who made them billionaires).
You know who has more power than a rapist? Somebody who rapes that lives in a country where it's illegal to be a rapist, but they get away with it due to government inaction. If you legalize all rape, then the actual rapist loses a lot of power over the victims (the people who got raped).
Therefore, I would argue that if rape is solely or primarily about power, legalizing rape means you get less rape.
If rape is about sexual pleasure, then right now, rape is a felony. If a few individuals out there commit rape primarily about sexual pleasure despite the risk that they might have their life ruined permanently over it, then that must mean the pleasure achieved from initial sexual contact for the man is extremely strong, it's safe to call it addicting.
So sex is objectively addicting. So is tobacco. Smoking tobacco is only legal if the supplier consents (tobacco store). Sex is only legal if the supplier consents (woman).
Stealing sex is sex rape (robbing sex, a crime comparable to murder). Stealing tobacco is smoke rape (robbing tobacco, a crime that's a misdemeanor).
If smoke rape was charged equally to sex rape (or if all rape was proportionally charged), then nobody would realistically ever commit product rape. Rape and theft would become interchangeable terms.
But sex theft is seen as very bad presumably because people want sex a lot. Only the non-virgins will understand. I don't have too because I'm a virgin.
But sex should be viewed as an addictive thing to do.

