For me, they should enjoy the work.
In an ideal world, everyone would do work that they enjoy.
In making certain choices, I can encourage that ideal world to exist. Or at least pretend to myself it does.
That said, reality is reality. Someone doing sex work who doesn't enjoy doing sex work is being exploited. But is the exploitation different if someone who doesn't enjoy mining for cobalt or diamonds or whatever, does so because the altenative is starving to death?