To pay for sex is a form of exploiting; the consent is not really free. There is no ethical consumption under capitalism, and I think that the exploitation of sex workers is one of the worst.
But morale is very subjective, and sex work is a very complex matter, where a lot of people, most of them women, work in very dangerous conditions and in situations of extreme need.
At least one of your down votes is for being racist and ableist. Could you remove it?