As for being paid to take the risk of being injured (and that is what it is): miners, armed forces (most of all and for not that much pay), many factory workers throughout the world, deep sea divers, those who compete for money in risky sports etc
They are paid for the risk, and required to follow health and safety regulations to minimise that risk. They are not required to exchange body fluids with customers during their jobs, nor take on excessive risk of infection. In any job where those are a risk, there are many requirements around wearing gloves, guards (so that body fluids cannot go into a worker's face) etc. This protective wear must be appropriately disposed of.
As I said, if prostitutes were to follow reasonably H&S standards - as dentists, miners, and deep sea divers certainly do, then I would be more open to the idea of it being a job - but until then, it's not, it's clearly exploitation.