Presumably if they are married the house that is bought if for them both to live in, as man and wife? Not for the woman to live in alone while the man lives elsewhere?! How is that any different to anywhere else in the world? If I were to marry, I would want to eventually buy a house with my partner, that's normal.

And is not anywhere near comparable with prostitution. One is the hourly rental of a woman for the purpose of satisfying your sexual urges, the other is providing a home for your family. If you cannot make a distinction between the two, it's probably the reason you are still sex-touring around Asia instead of settling down in a fulfilling relationship.