Sigh-Fi

Sex work etc is not selling the body as no organs etc are usually collected.

Also sex work has existed before money. It is a legitimate form of work, nurturing, care and a vital function of society, it's only 'bad' because of laws against it and cultural attitudes, people should have the right or not to choose to pursue it if that is what they wish, for whatever reason.

Also also, most people don't make that much money from it, so it's likely not always for that reason alone.