I think this is such a progressive view because many religious and some secular people still uphold the belief in the sanctity of marriage. To them sex never stopped being the most intimate and precious thing to share with a spouse and no one else. Add the fact that the rebranding of prostitution into sex work is still a very recent thing plus some things falling under the umbrella of sex work being very illegal in many places means that outside of twitter and extremely progressive spaces like universities no one wants to associate with someone that has turned the most socially taboo act possible into a business.