Honestly, I don't think it should be. It should be closely regulated to ensure sex workers aren't being coerced or exploited, that they can ensure they're safe (both from violence and from disease) and that they have the support they need to deal with the consequences of such work. But for those who choose to do this work whether it's out of desperation or because they think it's a good way to make money, they should have the same guarantee of support as a life guard or any other worker who comes into physical contact with other humans as part of their job requirement.
Honestly, I don't think it should be. It should be closely regulated to ensure sex workers aren't being coerced or exploited, that they can ensure they're safe (both from violence and from disease) and that they have the support they need to deal with the consequences of such work. But for those who choose to do this work whether it's out of desperation or because they think it's a good way to make money, they should have the same guarantee of support as a life guard or any other worker who comes into physical contact with other humans as part of their job requirement.