Well, prostitutes sell physical sexual services in exchange for money, or as some would say "sell their bodies". Online adult content creators sell images of their bodies/sexual services in exchange for money. It's sex work, but it's not the same thing. Selling their image for money is also what models do. Also, "prostitute" should not be employed as a degrading term, there is literally no argument that is not based on prejudice or made up morals to justify treating them as sub-humans.