Persons (usually female) who frequently engage in casual sex as a means of attaining some sort of material reward. This can be as simple as an actual prostitute demanding pay for access to her (or his) body, or as a means of sustaining a relationship of convenience. See sugar daddy. Not to be confused with a slut, a whore uses her charme to acquire wealth of a material nature.
"It took months of whoring myself out to perverse businessmen to get this bag. Look, it's Gucci."
"You had sex with him just for some concert tickets? What a whore!"