Rape implies something precious was taken.
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Gothca, so by your definition then, a prostitute cannot be raped. Interesting notion. Does that mean a college girl who has sex with a couple of different guys in her freshman year also cannot be raped? Where do you draw the line?
You don't see a conflict here? First, do you consider prostitution a legitimate way to make a living? If he'd have given her 20 bucks instead of her suggested retail of 30 is it still rape? If a prostitute gets stiffed of her pay has she been raped? Get real.