Your overweaning sense of superiority is showing.
I suspect that any large grouping of couples anywhere in the world will have a similar number of couples that can't stand each other , but are staying together for various reasons. Alcohol has the effect of allowing true feelings to emerge.
You don't seem to have much knowledge of prostitution around the world. No penalty for not doing so, but it leads one to erroneous conclusions.
It's no mystery to most why Thai prostitutes so often marry customers.
You don't mention if the sin sod got returned, and it likely was. It's mostly for show these days.