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.
Zx spectrum --> msx-dos --> ms-dos --dr-dos --> win95 --> Suse (before it was bought by novell) --> win98 --> debian