IMHO, "Rape" is a continuum... the lower end deserves (at most) shaming, the high end deserves prison & sex offender status. The problem is, feminists have expanded the definition of rape and pushed for the harshest punishments all the way down.
One line I'd draw to divide them is positive active harm (or threats of), vs cessation of assistance or mere inaction:
* If it's a freezing night, you're homeless, I owe you nothing, and my permission to let you spend the night in my warm house is contingent upon having sex you didn't want... and you do it to avoid getting told to leave... it isn't 'rape', it's prostitution with mutual beneficiaries and nothing more than a business transaction.
* If I'm an agent & I promise to try and get you acting jobs if you have unwanted sex, it's not rape. It's prostitution.
Now, revisiting those two scenarios a bit more...
You have a perfectly good home. I invite you to my home out in BFE & send a limo driver or let you fly in my private jet. You decline sex, and I threaten to throw you out in the cold. This falls somewhere on the rape spectrum because I actively contributed to youre vulnerable situation. I'd hesitate to say it's criminal rape worthy of prison & sex offender status, but should probably be an easy civil lawsuit for monetary damages.
Ditto, if I hire you as an actor actress, then fire you because you decline unwanted sex. Civil matter adequately covered by present-day labor law.
OK, suppose I physically detain you, or cause nonconsensual pain or injury. Rape. Ditto, if I threaten to not only fire you, but actively sabotage & harm your career as well. Prison is appropriate, but lifetime sex offender status might be negotiable. Or maybe, multiple levels of sex offender status ranging from "he'll take advantage of you, avoid becoming vulnerable to him" to "predatory pariah, keep him out of your neighborhood, away from your kids, and view him like a rattlesnake".
I'd say that draconian lifetime sex-offender-status is excessive and cruel in at least 10-30% of actual cases, precisely because the law presently acts like someone who rapes nuns & schoolgirls at knifepoint is as dangerous as someone who merely takes advantage of people with poor judgment or desperate needs who themselves tread into independent sex-worker territory.