Prostitution is generally a very relative concept. Every woman wants to have a rich husband and live in abundance. What is this not prostitution? Everyone needs money. I believe that any earnings is acceptable if does not harm others. Anyone who earns 10,000 in the industry are poisoning nature and does more harm than a prostitute, but respect him.
When a man provides a family, this is not considered prostitution. A wife can feed him in return, take care of the house and children.
Prostitution is the same. Just you covertly, told about the same. There is a trade, and there is a natural exchange. If in a poor country prostitutes will take the service of food, what would you call it prostitution or a civil marriage?
Civil marriage for me is the same hidden prostitution. A normal family in which a man is engaged in providing and protecting the natural function of the male is different from the consumer attitude.