If they are offering hand jobs, that's enough of a sexual activity for the moniker to fit, like it or not.
They're being paid for sexual services, even if they stay with "merely" giving guys hand jobs and letting the guys massage their naughty bits, as opposed to heading the whole way to penetration. They're certainly "sex workers," and the line distinguishing them from "full service" prostitutes is as nebulous as the clothing they're barely wearing.
Clinton played word games to evade certain aspects of Congressional censure; the things he did with Lewinsky were plenty enough to be considered "sexual misconduct" by his wife and by things like employment law despite not going "all the way" to penetration.