The issue is not christianity. The issue is the very human nature that’s hidden. In other word, in the absent of christianity, such as in china, in muslim world, and among liberal feminazis, we too will see opposition to prostitution or any efficient system.
The real issue is human nature. We can think of marriage as prostitution where everyone is the pimp. Everyone wants to be pimp and they do not want to compete with more efficient pimps. That’s all.