I guess the writer is confused with two different subjects; prostitution and polygamy. She wrote very well and the subject is interesting, but lacking facts.
I think prostitution is evil and we all agree with that, also is a big sin. But, if a married man/woman commits adultery while his wife or her husband is at home and transfers serious viruses and germs he/she got from the prostitute or other man then is why it is prohibited and is very common in our society (we call it cheating!). Besides husbands and wifes, many people in our communities are having boyfriend or girlfried while they are commited to their partners, why? the wirter never talk about this problems. Because there is need! And to discuss this part it will take forever...
On the other hand, polygamy is a different case. It is mainly practiced in some countries and religions. It is against the western values and is a crime; but is a legal way of protecting the society from the chaos that the west suffers from. And we must see this very closely to understand it. Also, this is debatable and we cannot talk about it online, unless we open a dialogue to exchange views.