You did this to yourself by implying that it's not possible to rape a prostitute (and no, I'm not accusing Nichushkin of rape).
If a prostitute is forced into prostitution (such as by a pimp beating her, trafficking her, taking her passport) then she's not really consenting to sex.
If a prostitute accepts money for sex that still isn't a license for the person paying her to do anything they want without limitations. If she accepts money for vaginal intercourse and you put it in her ass without asking, that's rape. If she decides she doesn't want to be a prostitute anymore halfway through and tries to leave and you don't let her, that's rape. If you pay her for one session and then try to screw her again without paying, that's rape. If you tell her you're going to use a condom and then take it off when she's not looking and screw her anyway, that's rape. If she's too intoxicated, that's rape.
Basically, your posts show a lack of understanding of consent. Consent is an ongoing thing. You don't just convince someone to say yes to sex once and then go nuts on them indefinitely.