I think this comes down to a deeper concept, Noam Chomsky talks about it as wage-slavery.
Basically "prostituting" yourself.
This might help shed some light on what is "right".
The stigma of sex being sold compared to manual labour being sold for an hourly wage is quite superficial honestly, but that's a non-factual and very emotional feeling.
Also, forced labour is just as bad as forced prostitution, clearly they are immoral.
In the case where the individual man or woman elects to do either out of a freedom of choice, given on an agreed-upon age of moral competence, then they are equally moral.